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Electronics, sensors, robotics kits, PC components, peripherals — everything Unik Systems carries, in one place.
KWS-MX18 10-in-1 USB Tester Digital LCD Voltage, Current & Power Meter
[Ammeter and Voltmeter] KWS-MX18 10-in-1 USB Tester – Digital LCD Voltage, Current & Power Meter The KWS-MX18 10-in-1 USB Tester is a compact multifunction digital testing instrument designed for monitoring and evaluating USB chargers, power banks, USB ports, mobile charging systems, and other DC power sources. It provides real-time measurement of voltage, current, power, capacity, energy, charging time, resistance, and internal temperature on its digital display. The tester supports a DC voltage range of 4–30V and current measurement up to approximately 5.1A, with power measurement up to 150W. It also provides capacity and energy monitoring, making it useful for checking the actual charging performance and capacity of USB power supplies and power banks. ⭐ Key Features 10-in-1 multifunction USB tester Digital LCD display Real-time voltage and current monitoring Measures power consumption Measures accumulated charging capacity Measures energy consumption Charging time measurement Charging resistance measurement Internal temperature measurement Positive and negative voltage measurement Stores measurement data in 9 groups Power-off memory function Compact and lightweight design Suitable for USB charger and power-bank testing Supports QC2.0 / QC3.0 according to available product information 📋 Technical Specifications Product Type: 10-in-1 USB Digital Tester Model: KWS-MX18 Input Voltage Range: DC 4–30V Current Measurement: 0–5.1A Power Measurement: 0–150W Capacity Measurement: 0–999999mAh Energy Measurement: 0–999999mWh Timing Range: 0–99 Hours Charging Resistance: 0–999.9Ω Internal Temperature: 0–80°C Positive Voltage Measurement: 0–10V Negative Voltage Measurement: 0–10V Memory Groups: 1–9 Display: Digital LCD Material: ABS Dimensions: Approximately 56.6 × 24.7 × 11.2mm Weight: Approximately 13.9g Input Connector: USB Output Connector: USB Function Button: Yes 🔍 10 Measurement Functions Voltage: 4–30V DC Current: 0–5.1A Power: 0–150W Capacity: 0–999999mAh Energy: 0–999999mWh Charging Time: 0–99 hours Charging Resistance: 0–999.9Ω Positive Voltage: 0–10V Negative Voltage: 0–10V Internal Temperature: 0–80°C 💾 Memory Function The KWS-MX18 can store charging measurement information in 9 separate memory groups. This allows you to compare charging capacity and energy measurements from different chargers or devices. The stored data can be viewed using the function button, and an individual memory group can be cleared by holding the button for approximately 3 seconds. 🔘 Button Functions Single Press: View stored measurement data from memory groups 1–9. Long Press: Clear the currently selected memory group. Double Press: Change the display page. Calibration: The device supports voltage and current calibration according to the supplied manual. 🔌 Applications USB Charger Testing Mobile Charger Testing Power Bank Testing USB Port Testing Mobile Phone Charging Analysis USB Cable Testing Power Supply Monitoring DC Power Measurement Electronics Troubleshooting DIY Electronics Projects Charger Performance Testing Battery Charging Analysis 🛠️ How to Use Connect the KWS-MX18 in-line between the USB power source and the USB-powered device. Once powered, the LCD displays the measured electrical parameters. You can use the function button to change display pages and access stored measurement data. It is particularly useful for comparing chargers, power banks, cables, and USB ports by monitoring actual voltage, current, power, capacity, and energy delivered. 📦 Package Includes 1 × KWS-MX18 10-in-1 USB Digital Tester ⚠️ Color Note: Color: White / Black Color will be shipped depending on stock availability. Any one color (White or Black) may be shipped based on available stock. Specific color cannot be guaranteed. ⚠️ Precautions Do not exceed the specified 30V DC input voltage. Do not exceed the specified current measurement range. Ensure correct USB connection direction before use. Keep the tester away from water and excessive moisture. Do not use it for measuring mains AC voltage. The device is intended for DC/USB power measurement. Actual measurement accuracy can depend on the connected source, load, cable, and operating conditions.
Black Plastic 3×18650 Battery Holder or Case Series Connection With Wire
[Lithium Battery Holder] Black Plastic 3×18650 Battery Holder – Series Connection The Black Plastic 3×18650 Battery Holder is designed to securely hold three 18650 lithium-ion battery cells in series configuration. It provides a convenient and organized way to mount 18650 cells for DIY battery packs, portable electronics, power supplies, LED projects, and other battery-powered applications. The holder is made from durable plastic and features mounting holes for secure installation using suitable screws. It is supplied with red and black connecting wires for convenient connection to an external circuit. ⭐ Key Features Designed for 3 × 18650 battery cells Series connection Black plastic construction Without cover Secure battery positioning Easy installation Built-in mounting holes Red and black connecting wires Suitable for DIY battery pack projects Compact and lightweight design 📋 Technical Specifications Product Type: 18650 Battery Holder Battery Capacity: 3 Cells Battery Type: 18650 Li-Ion Cell Configuration: 3S / Series Connection Nominal Output Voltage: Approximately 11.1V with 3.7V cells Fully Charged Voltage: Approximately 12.6V Material: Plastic Color: Black Cover: Without Cover Connection Wires: Red and Black Mounting: Screw Mount Mounting Holes: Yes Recommended Screw Size: Approximately 3mm Application: Battery Pack / Portable Electronics 🔌 Connection The three 18650 cells are connected in series, increasing the total voltage while maintaining the capacity of a single cell. With standard 3.7V nominal cells, the pack is approximately 11.1V nominal and 12.6V when fully charged. The red wire is the positive connection and the black wire is the negative connection. 🔧 Applications DIY 18650 Battery Packs 3S Lithium-Ion Battery Packs Portable Electronics LED Lighting Projects DIY UPS Projects Arduino Projects ESP8266 / ESP32 Projects Rechargeable Electronics Battery-Powered Devices Electronics Prototyping 📦 Package Includes 1 × 3×18650 Battery Holder / Case – Series Connection, Without Cover ⚠️ Precautions Use only compatible 18650 Li-Ion cells. Use three cells with matching capacity, chemistry, age, and charge condition. Use a suitable 3S BMS/protection and charging circuit. Do not mix damaged or mismatched cells. Check polarity carefully before installation. Do not short-circuit the battery terminals. Do not use damaged, swollen, or leaking cells. Ensure the holder and wiring are securely installed.
5.5 × 2.1mm DC Power Jack Plug with 2-Pin Screw Terminal
[Power Connector] 🔌 5.5 × 2.1mm DC Power Jack Plug with 2-Pin Screw Terminal (Male / Female) Standard DC Barrel Connector • 2-Pin Screw Terminal • Solder-Free Installation • Up to 5A Current Rating The 5.5 × 2.1mm DC Power Jack Plug with 2-Pin Screw Terminal is a convenient and reliable connector designed for quick and secure DC power connections without soldering. Compatible with the industry-standard 5.5mm outer diameter and 2.1mm inner diameter barrel connector, it is widely used in CCTV camera installations, LED lighting, routers, power adapters, and DIY electronics projects. Available in Male and Female variants, this connector features a 2-pin screw terminal that allows wires to be connected easily using a screwdriver. The clearly marked positive (+) and negative (–) terminals help prevent wiring errors, making installation simple for both professionals and hobbyists. Manufactured with a durable ABS plastic housing and nickel-plated metal contacts, this connector provides reliable electrical performance, corrosion resistance, and long service life. Its reusable design makes it ideal for prototyping, repairs, and permanent installations. ⭐ Features Standard 5.5 × 2.1mm DC barrel connector Available in Male and Female versions 2-pin screw terminal for quick wire connection No soldering required Clearly marked positive (+) and negative (–) terminals Supports up to 5A current Durable ABS plastic housing Nickel-plated contacts for improved conductivity Secure and reusable connection Easy plug-and-play installation Suitable for 12V and 24V DC systems Ideal for DIY electronics and repair work 📋 Technical Specifications Product Type: DC Power Jack Plug with Screw Terminal Connector Type: Male / Female Barrel Size: 5.5mm (Outer) × 2.1mm (Inner) Terminal Type: 2-Pin Screw Terminal Rated Voltage: 0–30V DC Recommended Operating Voltage: 12V / 24V DC Maximum Current: Up to 5A Housing Material: ABS Plastic Contact Material: Nickel-Plated Metal Mounting Type: Inline Cable Mount Wire Compatibility: Up to 22 AWG Polarity Marking: Positive (+) / Negative (–) Operating Temperature: -20°C to +80°C 🔧 Applications Suitable for: CCTV Camera Power Connections LED Strip Lighting LED Sign Boards DC Power Adapters Routers and Modems Arduino Projects Raspberry Pi Projects DIY Electronics Battery Packs Power Distribution Systems Industrial Control Equipment Testing and Prototyping Electronic Repairs Low-Voltage DC Power Systems 📦 Package Includes 1 × 5.5 × 2.1mm DC Power Jack Plug with 2-Pin Screw Terminal (Male or Female variant as selected) ⚠️ Note Please select the required Male or Female connector variant before ordering. Verify polarity before connecting power to avoid damage to connected devices. Suitable for low-voltage DC applications only. Product appearance may vary slightly depending on the manufacturing batch.
3.7V BMS 1S 2A 18650 Lithium Battery Protection Board
[Lithium Battery Protection Board] The 1S 3.7V Lithium Battery Protection Board (BMS/PCM) is a compact battery management module designed specifically for single-cell lithium-ion batteries such as 18650, 14500, and similar 3.7V rechargeable cells. It continuously monitors battery voltage and current to ensure safe charging and discharging operations. In addition, the module provides multiple layers of protection including overcharge, over-discharge, overcurrent, and short-circuit protection. As a result, it helps extend battery life and improves the safety of battery-powered devices. Because of its compact size, the protection board can be easily integrated into DIY battery packs, portable electronics, LED lighting systems, and rechargeable battery projects. Furthermore, the board uses nickel-strip compatible terminals for easy battery pack assembly. The protection circuit is designed for long-term reliable operation and helps prevent damage caused by improper charging or excessive current draw. Moreover, it offers high voltage detection accuracy for improved battery management performance. ⚠️ Note: This protection board is designed for 3.7V Lithium-Ion batteries only and is not suitable for LiFePO4 batteries. 🔹 Key Features Single-cell (1S) lithium battery protection board Suitable for 18650 lithium-ion batteries Overcharge protection Over-discharge protection Overcurrent protection Short-circuit protection High voltage detection accuracy Compact and lightweight design Easy installation and integration Long operational life 🔹 Pin Configuration B+ : Battery Positive Terminal B- : Battery Negative Terminal P+ : Charge / Discharge Positive Terminal P- : Charge / Discharge Negative Terminal 🔹 Technical Specifications Product Type: Lithium Battery Protection Module (BMS/PCM) Battery Configuration: 1S (Single Cell) Compatible Battery Type: 3.7V Lithium-Ion (18650, 14500, etc.) Operating Voltage Range: 3.2V – 4.2V Overcharge Detection Voltage: 4.25 ± 0.05V Overcharge Release Voltage: 4.23 ± 0.05V Over-discharge Detection Voltage: 2.54 ± 0.1V Continuous Charge Current: 2A Continuous Discharge Current: 2A Maximum Supported Current: 2A – 5A Protection Functions: Overcharge, Over-discharge, Overcurrent, Short Circuit Terminal Type: Nickel Strip Compatible Board Life Expectancy: More than 20,000 Operating Hours 🔹 Applications This protection board is suitable for: 18650 battery packs Rechargeable lithium battery projects DIY power banks Portable electronics LED lighting systems Battery-powered devices Robotics projects Arduino and ESP32 power systems 🔹 Important Notes Not suitable for LiFePO4 batteries Not recommended for high-current motors above 4A Not suitable for electric bicycles or high-power battery packs Ensure correct polarity during installation Use only with compatible lithium-ion cells 🔹 Package Includes 1 × 1S 3.7V 2A Lithium-Ion Battery Protection Board (BMS/PCM)
2S 20A 7.4V / 8.4V 18650 Lithium Battery Protection Board with Balance
[Li-ion Rechargeable Battery Charger, Lithium Battery Protection Board] The 2S 7.4V / 8.4V 20A Lithium Battery Protection Board with Balancing is a compact and reliable Battery Management System (BMS) designed for 2-cell (2S) 18650 lithium-ion battery packs. This board provides complete protection and automatic cell balancing to ensure safe charging, stable discharging, and long battery life. With a nominal output of 7.4V and a full charge voltage of 8.4V, this protection board supports continuous current up to 20A, making it suitable for medium-power applications such as DIY battery packs, portable power tools, robotics, LED systems, solar projects, and backup power supplies. The built-in balancing function equalizes the voltage between both cells during charging, preventing overcharging of individual cells and improving overall pack efficiency and lifespan. Multiple protection features including over-charge, over-discharge, over-current, and short-circuit protection ensure maximum safety during operation. Compact in size and easy to wire, this BMS is ideal for both DIY users and professional battery pack manufacturers. ⭐ KEY FEATURES ✔ Designed for 2S (2-cell) 18650 lithium battery packs✔ 20A continuous discharge current support✔ Built-in cell balancing function✔ Protection against over-charge, over-discharge, over-current & short circuit✔ Improves battery safety, performance & lifespan✔ Compact PCB – easy to integrate✔ Ideal for DIY & professional battery pack builds 🔧 TECHNICAL SPECIFICATIONS Battery Configuration: 2S (2 cells in series) Nominal Voltage: 7.4V Full Charge Voltage: 8.4V Maximum Continuous Current: 20A Battery Type: 3.7V Li-ion (18650 rechargeable cells) Balancing Function: Yes (automatic during charging) Protection Functions: Over-charge protection Over-discharge protection Over-current protection Short-circuit protection 🔌 WIRING GUIDE – How to Connect 2S Battery Pack 🔹 Board Terminals (Typical Marking) B- → Battery negative (Cell 1 −) B1 → Between Cell 1 & Cell 2 B+ → Battery positive (Cell 2 +) 🔹 Output / Charger Terminals P- → Load / Charger negative P+ → Load / Charger positive (same as B+) 🔧 Connection Steps Connect Cell 1 negative → B- Connect Cell 1 positive / Cell 2 negative → B1 Connect Cell 2 positive → B+ Connect Load & Charger + → P+ (or B+) Connect Load & Charger − → P- ⚠️ Use only matched 18650 cells and an 8.4V Li-ion charger. 🎯 APPLICATIONS DIY lithium battery packs Power tools & cordless devices Robotics & automation projects LED lighting systems Solar battery packs Backup power & portable energy systems 📦 PACKAGE INCLUDES 1 × 2S 20A Lithium Battery Protection Board with Balancing
Battery Voltage Wire 7/36 Black & Red 1 Meter – Flexible Copper Hook-Up Wire (Pair)
[Hook up wire] The Battery Voltage Wire 7/36 Black & Red is a high-quality flexible hook-up wire specially designed for battery connections, low-voltage power lines, and electronic circuits. Made with 7 strands of 36-gauge copper, this wire provides excellent conductivity, durability, and flexibility for easy routing in compact spaces. The wire comes in red and black insulation, making it perfect for identifying positive and negative terminals in battery packs, power supplies, inverters, chargers, and DIY electronics projects. With strong PVC insulation and fine stranded copper core, this wire is suitable for low-current DC applications, hobby electronics, Arduino projects, robotics, and general internal wiring. 🔹 Key Features High-quality 7/36 stranded copper conductor Red & Black color for easy polarity identification Highly flexible and easy to bend and route Low resistance for stable voltage transmission Durable PVC insulation for long life Ideal for low-voltage and low-current applications Suitable for DIY electronics, battery packs, and repair work 🔹 Technical Specifications Wire Type: Hook-up / Battery Voltage Wire Conductor Size: 7 / 36 (7 strands of 36 AWG) Material: Pure copper stranded core Insulation: PVC Color: Red & Black Rated Voltage: Up to 300V (typical) Current Rating: Low current applications Flexibility: High Application Type: DC wiring, battery leads, signal & power lines 🔹 Applications Battery pack connections Arduino and microcontroller projects Power supply wiring Robotics and automation Inverter and charger wiring (low current) DIY electronics and prototyping Repair and internal equipment wiring 🔹 Package Contents 1 × Red 7/36 Battery Wire 1 × Black 7/36 Battery Wire
18650 Lithium Battery Insulation For Nigative Pad 25 Pcs in one Sheet
[Insulation Paper] 18650 Lithium Battery Insulation For Nigative Pad This Single Hole Electrical Insulating Adhesive Mat for Battery Cell terminal Insulation is a cardboard paper for an 18650 battery insulator. Better protection to avoid short circuits on batteries.Easy peel-and-stick application. The Outer Ring Diameter is 17mm. The Thickness: is 0.25mm Battery Insulators Adhesive Paper Rings. Tags, 18650 Battery Insulator Ring Negative, 18650 Lithium Battery Insulation Ring For Negative Pad, Single Hole Electrical Insulating Adhesive Mat for Battery Cell Terminal Insulation. Tags, 18650, 18650 Battery Cover, Electrical Insulating Adhesive Mat, Lithium Battery Insulation Pad, 18650 Insulation Pad, 18650 21700 26650 32650 Adhesive corrugated paper, Battery Electrical Insulator Insulation Ring Adhesive For Negative Terminal. To buy an 18650 Lithium Battery: Click Here How to use.? Take off each insulation paper from the base paper. Put and stick upper hollow adhesive insulation paper on the top of the battery Negative. Put and stick lower solid adhesive insulation paper on the negative. Then, you can weld Ni tape or Ni-plated steel plate with positive, and negative to make the battery pack. Features: Easy to Install Heat-Resistant Design Compact and Lightweight Positive and Negative Terminal Insulation Features/Specs: Material: Barley Paper Compatibility: 18650/18500 Lithium Battery Ring Pad Use For Negative Terminal Outer Ring Diameter: 17 mm Thickness: 0.25 mm Applications: Electronic devices powered by 18650 battery cells Flashlights and portable lighting solutions DIY battery packs and configurations Power banks and battery-operated gadgets Custom battery projects and prototypes Package Includes: 1 x 18650 Lithium Battery Insulation Ring For Negative Pad Note: Product Images are shown for illustrative purposes only and may differ from the actual product
8mm White Color LED – Diamond Shape LED
[LEDs] A standard 8mm White Color Diamond Shape that can be used for indication or visualization purposes. It can be used on breadboard, dot board and PCB. You can also use LED mount to fix them onto casings or enclosures. The longer lead is the positive and the shorter lead is the negative. Specifications: Lighting Color: White Voltage: 3V Size/Dimension: 8mm Lens Type: Clear 8mm LED Applications: Used as indicators in products and designs Toys & Games Lighting Products Electronic projects Package Includes: 1 PC of 8mm White Color LED – Diamond Shape LED
Banana Plugs Terminal Connectors Male Red and Black Pair 4mm Good Quality
[Power Connector] 4mm Banana Plug Terminal Connectors – Male Red & Black Pair The 4mm Banana Plug Terminal Connectors are reliable and convenient connectors designed for audio equipment, industrial instruments, power testing, automotive testing, laboratory equipment, and DIY electronics projects. With a standard 4mm banana plug diameter, these connectors are compatible with most standard 4mm banana sockets and test equipment. The screw-type connector fitting allows wires to be securely connected without soldering, making installation quick, simple, and reusable. The stackable design also allows the plugs to be connected with existing 4mm banana plugs, providing greater flexibility for testing and power connections. The Red and Black color combination makes it easy to identify positive and negative connections, making these plugs suitable for power supplies, test leads, speakers, electronic instruments, and other electrical applications. ⭐ Key Features Standard 4mm banana plug diameter Red and Black male banana plug pair Screw-type wire connection No soldering required Easy installation and removal Secure and reliable electrical connection Stackable design Compatible with standard 4mm banana sockets Easy positive/negative identification Suitable for audio, testing, laboratory, and electronic applications 📋 Technical Specifications Product Type: Banana Plug Terminal Connector Connector Type: Male Banana Plug Diameter: 4mm Color: Red & Black Connection Method: Screw Terminal Soldering: Not Required Design: Stackable Current Rating: 10A Typical Voltage Rating: Typically up to 30–60V DC, depending on application Contact Type: Spring Contact Application: Audio, Power Testing & Electronics 🔧 Applications Audio Equipment Speaker Connections Power Supply Connections Laboratory Power Supplies Multimeter Test Leads Electronic Test Equipment Industrial Instruments Power Testing Automotive Testing DIY Electronics Projects Electrical Prototyping Battery Testing ⚠️ Precautions Do not exceed the connector's actual current and voltage limits. Ensure the wire is securely tightened inside the screw terminal. Always observe correct polarity when connecting DC power. Use appropriately rated wires for the desired current. Avoid short-circuiting the connector. 10A is a typical rating and should not be treated as a guaranteed manufacturer specification unless confirmed for the specific batch/model. 📦 Package Includes 1 × Red 4mm Male Banana Plug 1 × Black 4mm Male Banana Plug
5V 2.4A Lithium Battery Digital Display Charging Module with Dual USB Power Bank Module
[Lithium Battery Protection Board] Dual USB Output • LED Battery Display • Built-in Protection • DIY Power Bank Module The Dual USB 5V Power Bank Charging Module is a compact and feature-rich charging and protection board designed for building custom power banks using 3.7V Lithium-Ion or Lithium Polymer batteries. Supporting both USB Type-C and Micro USB charging inputs, the module provides convenient charging compatibility while delivering stable 5V output through dual USB ports. Equipped with an intelligent boost converter, the module efficiently converts the battery voltage (3.0V–4.2V) into a regulated 5V output with a maximum output current of 2.4A, making it suitable for charging smartphones, tablets, Bluetooth devices, smartwatches, and other USB-powered electronics. The onboard digital LED display shows the battery level from 0% to 100% in real time and also indicates charging (IN) and discharging (OUT) status, allowing users to easily monitor battery capacity. Designed with multiple safety features including overcharge, over-discharge, over-current, short-circuit, and constant current protection, this module ensures safe and reliable operation. It also includes dedicated LED terminals for adding a flashlight, making it an ideal solution for DIY portable power bank project Note: This module is designed for single-cell (1S) 3.7V Lithium-Ion/Li-Po batteries connected in parallel only. Do not connect batteries in series, as doing so may permanently damage the module. ⭐ Features Supports USB Type-C and Micro USB charging input Dual USB output ports for charging two devices simultaneously Maximum output current up to 2.4A Intelligent 5V boost converter Real-time LED battery percentage display (0–100%) Charging and output status indicators Built-in flashlight LED connection High conversion efficiency Multiple protection circuits for safe operation Compact PCB design for DIY power bank projects 📋 Technical Specifications Product Type: Power Bank Charging & Protection Module Battery Type: Single Cell (1S) Lithium-Ion / Lithium Polymer Battery Voltage: 3.0V–4.2V DC Charging Input: USB Type-C & Micro USB Input Voltage: 5V DC USB Output Ports: 2 Output Voltage: 5V DC Maximum Output Current: 2.4A Display Type: Digital LED Battery Percentage Display Battery Indicator: 0–100% Status Indicators: Charging (IN) / Output (OUT) Protection Functions: Overcharge Protection Over-discharge Protection Over-current Protection Short Circuit Protection Constant Current Charging LED Flashlight Output: Supported Module Dimensions: Approx. 65 × 25 × 10 mm 🔧 Applications Suitable for: DIY Power Banks 18650 Battery Packs Lithium Battery Projects Portable USB Chargers Emergency Power Supplies Mobile Phone Chargers Bluetooth Speaker Power Banks Raspberry Pi Power Supply Arduino Projects Portable Electronics DIY Electronics Battery Backup Systems 📦 Package Includes 1 × Dual USB 5V Type-C & Micro USB Power Bank Charging Module with LED Display ⚠️ Important Notes Connect the battery correctly: B+ to battery positive and B- to battery negative. Incorrect battery polarity may permanently damage the module. Use 3.7V Lithium-Ion or Li-Po batteries only. If using multiple cells, connect them only in parallel. Do not connect batteries in series, as this may cause overheating and permanent module failure. Quick Charge performance depends on the connected device, charging cable, charger, and battery quality.
Out of stockSingle Pole 75A Power Connector Red and Black
[Power Connector] Description Current Rating: 75 amps Voltage Rating: Up to 600V (depending on application) Connector Type: Single pole, quick-disconnect Material: High-impact plastic housing, copper contacts Color: Typically color-coded for polarity (e.g., red for positive, black for negative) Applications: Electric vehicles, solar power systems, battery banks, industrial equipment, power distribution Temperature Range: Typically -40°C to 105°C Locking Mechanism: Secure latch or snap-in design to prevent accidental disconnection Contact Resistance: Low resistance for minimal voltage drop and efficient power transmission Features: Polarized for correct connection, durable and reliable performance in high-current systems The Single Pole 75A Connector is a high-current electrical connector designed for applications requiring secure and reliable connections. Rated for 75 amps, this connector is ideal for use in high-power systems such as electric vehicles (EVs), solar energy setups, battery banks, and industrial machinery. It features a quick-disconnect design, allowing for easy and safe connection and disconnection. The connector typically has a polarized design to ensure correct connections and prevent mistakes. With a durable, high-impact plastic housing and copper contacts, it ensures low contact resistance, minimal voltage drop, and long-lasting performance in demanding environments. Power Pole Connector PA75 Power plug Red & Black QS connector Features: QS connector ensures secure and efficient fit. Low resistance for stable power transfer. Versatile for RC, energy storage, and other applications. Package Includes: 1 x Single Pole 75A Power Connector Red and Black
Out of stockZB2L3 18650 Li-ion Lithium Lead-acid Battery Capacity Meter Discharge Tester Analyzer
[Battery Capacity Tester] Description: Material: Electrical components Color: See pictures ZB2L3 battery capacity tester discharge type 1.2-12V external load capacity of the battery and other tests 18650 Tools, single-function, by controlling the load off and get real-time integrated discharge current capacity results Maximum support 15V 3A discharged through the discharge voltage and current, itself does not discharge Maximum capacity statistics support 9999Ah (9999000mAh) Automatically identifying and developing appropriate battery termination voltage can also be manually adjusted Specifications: Power supply voltage: DC4.5-6V (micro USB connector) Operating Current: less than 70mA Discharge voltage: 1.00V-15.00V 0.01V resolution Termination voltage range: 0.5-11.0V Supported by current: 3.000A 0.001A resolution Maximum voltage measurement error: 1% + 0.02V Maximum current measurement error: 1.5% + – 0.008A Maximum battery capacity range: 9999Ah (1Ah = 1000mAh) greater value by shifting the decimal point to switch, when the display is less than 10Ah X.XXX, as shown above to achieve 10Ah XX.XX, and so on. Board size: 50mmX37mm Finished Size: 50mmX37mmX17mm (length X width X height maximum position size, contains copper foot height) Instructions: 1. The first test should be a fully charged battery. 2. Connect the battery to be tested positive to positive input, a negative input to the negative, can not be reversed (with load reversal may damage the circuit)! Load connected to the output of the positive and negative output, to work through the tester micro USB power supply (not available desktop or laptop USB powered), then the battery voltage. 3. Direct start test need only one press of the “OK” button, the tester can automatically develop an appropriate termination voltage of the battery full charge voltage, and will start flashing after the test three times. Need to develop artificial termination voltage only when the battery voltage display state by pressing “+” or “-” buttons to modify the termination voltage display beginning with P, behind the representative voltage resolution 0.1V, set up after pressing the “OK “start testing. 4. After the start of the test the tester will control the load of the electronic switch is turned on, the test data shows that the process will release capacity (Ah), current discharge current (A) and battery voltage (V) between the wheel was. When the battery voltage reaches the set cut-off voltage, load control switches off the tester display data stays in capacity (Ah) and above and the corresponding indicator flashes quickly together, now displays the actual capacity of the battery is discharging capacity, about the press “OK” to terminate flashing allows stable data display, press again “OK” button to return to the power-on state can just replace the battery test the next section …… Error codes and their meanings: Err1: battery voltage is above 15V Err2: battery voltage is lower than the termination voltage Err3: Battery can not afford to load or discharge current line too much resistance Err4: overcurrent (current exceeds 3.1A) Err5:Improper use or incorrect wiring has caused the device to be burned out and cannot be used (current sampling or control switch MOS burned out). Note: Use the resistance of the discharge process, resistive load will seriously heat, please pay attention to safety! This circuit voltage in order to improve the measurement accuracy, specially designed DC bias, when the terminal displays nothing then a small voltage does not affect the actual measurement, if you are shorting the input terminals (absolute 0V) will show 0 No retail package Quantity:1Pc Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!! Package Content: 1Pc x battery capacity tester 2Pc x Load resistor Power Battery Capacity Tester LED Display Micro USB Li-ion Lithium 18650 External Load Battery Discharge Testing Analyzer
IC 7812 TO-220 12V Linear Voltage Regulator ST (L78M12CV/L7812CV/LM7812)
[Voltage Regulator IC] LM7812 12V Linear Voltage Regulator IC 7812 The L78M12CV is a three-terminal positive Voltage Regulator with several fixed output voltages, making it useful in a wide range of applications. This regulator can provide local on-card regulation, eliminating the distribution problems associated with single point regulation. Each type employs internal current limiting, thermal shutdown and safe area protection, resulting it essentially indestructible. If adequate heat sinking is provided, they can deliver over 0.5A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents. Features- Thermal Overload Protection Short-circuit Protection Output Transition SOA Protection 4% Output Voltage Tolerance Guaranteed in Extended Temperature Range Applications: Power Management
IC 7805 TO-220 Linear Voltage Regulator LM7805 Made ST
[Voltage Regulator IC] LM7805 5V Linear Voltage Regulator IC 7805 The L78M05CV is a fixed output, three-terminal precision positive voltage regulator in 3 pins TO-220 package. This regulator can provide local on-card regulation by eliminating distribution problems associated with single-point regulation. The L78M05CV fixed voltage regulator is designed with thermal overload protection that shuts down the circuit when subjected to an excessive power overload condition, internal short circuit protection that limits maximum current the circuit will pass and output transistor safe area compensation that reduces the output short circuit as the voltage across the pass transistor is increased. If adequate heat sinking is provided then this positive voltage regulator can deliver over 0.5A output current. Features: Fixed output voltage is 5V Output current is 0.5A Dropout voltage is 2V Maximum DC input voltage is 35V Output transition SOA protection Output voltage tolerance is 4% Operating temperature range 0°C to 125°C Applications: Power Management. Note: Image may vary from actual product in terms of Manufacturer/Brand name according to availability.
High Quality Ultra Flexible 18AWG Silicone Wire 1m (Red) + 1m (Black)
[Silicon Wire] The High-Quality 18AWG Silicone Wire 1m (Red) + 1m (Black) pair has a pretty big diameter as compared to the normal 18AWG wire used in RC projects for serving its specific purpose. This wire has low resistance and high current carrying capacity. These are also used in LiPO batteries to deliver power to ESC’s. Ideal for your RC project. It is super flexible and soft with a high strand count which means it is great for use in restrictive and compact areas. The wire is the first priority tool for carrying current from one circuit to other while their current carrying capacity is dependent upon the size of the wire. So the High Quality 18AWG Silicone Wire 1m (Red) + 1m (Black) both has the considerable diameter to suit your application. Please find out our more cable and wires. Click here Wires with the wide variety of silicon wire gauges and colors to suit your applications are available The 18AWG High Temperature Silicone Wire is a premium-quality flexible electrical cable designed for low to medium current applications requiring excellent flexibility and high-temperature resistance. Manufactured using high-purity tinned copper conductors with soft silicone rubber insulation, this wire provides outstanding electrical conductivity, corrosion resistance, and long service life. Rated for 600V and capable of operating continuously at temperatures up to 200°C, this silicone wire is suitable for battery packs, RC models, drones, LED lighting, robotics, power supplies, automotive wiring, solar systems, and DIY electronic projects. The tinned copper conductor ensures efficient current transfer with minimal voltage drop while resisting oxidation and corrosion. Its ultra-flexible silicone insulation allows easy routing through tight spaces and provides excellent durability in demanding environments. This package includes 1 meter of Red wire and 1 meter of Black wire, making it ideal for positive and negative wiring in electronic and electrical applications. ⭐ Features Premium 18AWG silicone insulated wire High-purity tinned copper conductor Ultra-flexible silicone insulation Rated for 600V operation Heat resistant up to 200°C Excellent electrical conductivity Corrosion-resistant tinned copper strands Easy to strip, solder, and terminate Soft, durable, and wear-resistant insulation Suitable for indoor and outdoor applications 📋 Technical Specifications Product Type: High Temperature Silicone Wire Wire Gauge: 18 AWG Conductor Material: Tinned Copper Insulation Material: High Temperature Silicone Rubber Rated Voltage: 600V Rated Temperature: 200°C Rated Current: 8A (Typical) Wire Type: Flexible Multi-Strand Marking: 18AWG 600V 200°C Wire Color: Red & Black Length: 1 Meter Red + 1 Meter Black (Total 2 Meters) 🔧 Applications Suitable for: Lithium Battery Packs RC Cars & RC Boats FPV Drones Model Aircraft Solar Power Systems LED Lighting Power Supplies Robotics Projects Arduino Projects ESP32 Projects Raspberry Pi Projects Automotive Wiring Electric Scooters & E-Bikes DIY Electronics Laboratory Equipment Industrial Control Panels 📦 Package Includes 1 × 18AWG High Temperature Silicone Wire – Red (1 Meter) 1 × 18AWG High Temperature Silicone Wire – Black (1 Meter)
4S 20A 18650 Lithium Battery Protection Board
[Lithium Battery Protection Board] The HXYP-4S-BM20 4S 20A Lithium Battery Protection Board (BMS) is a compact and reliable battery management system designed specifically for 3.7V lithium-ion 18650 rechargeable cells. This board provides complete protection and safe operation for building 4-cell (4S) battery packs with a nominal output voltage of up to 14.8V and a full charge voltage of 16.8V. Featuring a square, lightweight, and portable design, this protection board is easy to integrate into custom battery packs and compact enclosures. It allows you to connect four 18650 lithium cells simultaneously and ensures balanced and safe charging and discharging. The board includes multiple built-in safety protections such as over-charge protection, over-discharge protection, over-current protection, and short-circuit protection, helping to extend battery life and prevent damage or hazardous conditions. This module is ideal for use in DIY battery packs, power tools, solar storage systems, electric scooters, backup power supplies, robotics, and other lithium battery applications. ⭐ Key Features ✔ Designed for 4S (4-cell) 18650 lithium-ion battery packs ✔ Supports continuous current up to 15A ✔ Built-in protection for over-charge, over-discharge, over-current & short circuit ✔ Compact square PCB design – easy to install ✔ Low power consumption with ultra-low quiescent current ✔ Increases battery safety, reliability, and lifespan 🔧 Technical Specifications Model: HXYP-4S-BM20 Battery Type: 3.7V Li-ion (18650 rechargeable cells) Configuration: 4S (4 cells in series) Charging Voltage: 16.8V Maximum Continuous Current: 15A Maximum Peak Current: 20A Over-Charge Voltage: 4.25 ± 0.05V per cell Over-Discharge Voltage: 2.5 ± 0.05V per cell Quiescent Current: < 30 µA Board Size: 3.6 × 3.6 cm Country of Origin: China 🎯 Applications DIY lithium battery packs Power tools & backup batteries Solar energy storage systems Electric scooters & e-bikes Robotics & embedded systems UPS & portable power stations 🔹 Battery Connection Terminals on Board Usually marked as: B- → Battery Pack Negative (Cell 1 –) B1 → Connection between Cell 1 & Cell 2 B2 → Connection between Cell 2 & Cell 3 B3 → Connection between Cell 3 & Cell 4 B+ → Battery Pack Positive (Cell 4 +) 🔹 Output / Charge Terminals P- → Load / Charger Negative P+ → Load / Charger Positive (same as B+) 🔧 Step-by-Step Wiring Connect 4 cells in series: Cell order:Cell1 → Cell2 → Cell3 → Cell4 Then wire as: Cell1 negative → B- Cell1 positive / Cell2 negative → B1 Cell2 positive / Cell3 negative → B2 Cell3 positive / Cell4 negative → B3 Cell4 positive → B+ For charging & discharging: Charger / Load positive → P+ (or B+) Charger / Load negative → P- ⚠️ Safety Tips Always connect balance wires before main power wires Use proper insulated wires and nickel strips Do not short any terminals Use a 16.8V Li-ion charger for 4S packs Ensure BMS current rating matches your load 📦 Package Includes 1 × -4S-BM20 4S 20A Lithium Battery Protection Board (BMS) * Product Images are shown for illustrative purposes only and may differ from actual product.
0.28 inch 3.5-30V Two Wire DC Voltmeter Yellow
[Ammeter and Voltmeter] This is tiny and compact digital voltmeter with red LED Display. 0.28inch 3.5-30V Two Wire DC Voltmeter Yellow Panel requires only a few minutes of configuration and is as simple as directly connecting wires to the source you want to measure and seeing the LED blink!!!! The red wire is to connect to the positive pole, the black wire is to connect to the negative pole. No need to worry even if there is any connection mismatch of the wires, the electric circuit wont be a boom because it features reverse polarity protection. This voltmeter doesn't need external drive working power, it can work with measuring voltage, the working voltages range is 3.5-30V. To reach the best measurement accuracy, this voltmeter will automatically move the decimal points position according to the different measuring voltage. When it measures the voltage below 10V, it will display two places after the decimal point. When it measures the voltage above 10V, it will display one place after the decimal point. This voltmeter can be used to measure the storage battery's voltage in motorcycles and cars and also can grasp the storage batterys status. It also can be used to measure other voltage. 30V is the voltmeters maximum operating limited voltage, please leave enough margin when working, to avoid voltmeters permanent damage because of an electrical spark, power supply ripple, or other too high abrupt change of voltage. Very bight and decent LED Display is ready to measure the dc voltages in the range of 3.5V to 30V. Connections : Red Wire: source +ve terminal. Black Wire: Source -ve terminal. Note: The display weight and Dimensions may have2% error. Features : Very small and lightweight voltmeter module. Very handy and easy to use. Green LED display. Dont need the external power supply because it is a self-powered version of this display. Best operates in the working voltage range of 5V to 24V 100% Brand new and high quality. 📑 Additional Information Accuracy: 0.1 VColor: YellowWires: 2 (Two-Wire Design)Display ON Voltage: 2.5 VOperating Voltage: 3.6 V ~ 28 V DCCurrent Consumption: 15 mARefresh Speed: 200 ms (one update)Minimum Input Voltage: 3.6 VMaximum Input Voltage: 28 VOperating Temperature: -10°C to 60°CMounting Hole Distance: 3 cmHeight: 0.72 cmLength: 1.3 cmWidth: 3 cmWeight: 3 g Package Includes : 1 x 0.72 cm (0.28 inch) 3.5-30V Two Wire DC Voltmeter Yellow * Product Images are shown for illustrative purposes only and may differ from actual product.
0.28 inch 3.5-30V Two Wire DC Voltmeter Green
[Ammeter and Voltmeter] This is tiny and compact digital voltmeter with red LED Display. 0.28inch 3.5-30V Two Wire DC Voltmeter Green Panel requires only a few minutes of configuration and is as simple as directly connecting wires to the source you want to measure and seeing the LED blink!!!! The red wire is to connect to the positive pole, the black wire is to connect to the negative pole. No need to worry even if there is any connection mismatch of the wires, the electric circuit wont be a boom because it features reverse polarity protection. This voltmeter doesn't need external drive working power, it can work with measuring voltage, the working voltages range is 3.5-30V. To reach the best measurement accuracy, this voltmeter will automatically move the decimal points position according to the different measuring voltage. When it measures the voltage below 10V, it will display two places after the decimal point. When it measures the voltage above 10V, it will display one place after the decimal point. This voltmeter can be used to measure the storage battery's voltage in motorcycles and cars and also can grasp the storage batterys status. It also can be used to measure other voltage. 30V is the voltmeters maximum operating limited voltage, please leave enough margin when working, to avoid voltmeters permanent damage because of an electrical spark, power supply ripple, or other too high abrupt change of voltage. Very bight and decent LED Display is ready to measure the dc voltages in the range of 3.5V to 30V. Connections : Red Wire: source +ve terminal. Black Wire: Source -ve terminal. Note: The display weight and Dimensions may have2% error. Features : Very small and lightweight voltmeter module. Very handy and easy to use. Green LED display. Dont need the external power supply because it is a self-powered version of this display. Best operates in the working voltage range of 5V to 24V 100% Brand new and high quality. Additional information Accuracy 0.1 V Color Green Wires 2 Display ON Voltage (V) 2.5 Operating Voltage (VDC) 3.6 ~ 28 Current Consumption (mA) 15 Refresh Speed (ms) 200 (one time) Minimum Input (V) 3.6 Highest Input (V) 28 Operating Temperature (C). -10 to 60 Holes for Mounting 3 cm Height (cm) 0.72 cm Length (cm) 1.3 cm Width (cm) 3 cm Weight (gm) 3 gm Package Includes : 1 x 0.72 cm (0.28 inch) 3.5-30V Two Wire DC Voltmeter Green * Product Images are shown for illustrative purposes only and may differ from actual product.
0.28 inch 3.5-30V Two Wire DC Voltmeter Blue
[Ammeter and Voltmeter] This is tiny and compact digital voltmeter with red LED Display. 0.28inch 3.5-30V Two Wire DC Voltmeter Blue Panel requires only a few minutes of configuration and is as simple as directly connecting wires to the source you want to measure and seeing the LED blink!!!! The red wire is to connect to the positive pole, the black wire is to connect to the negative pole. No need to worry even if there is any connection mismatch of the wires, the electric circuit wont be a boom because it features reverse polarity protection. This voltmeter doesn't need external drive working power, it can work with measuring voltage, the working voltages range is 3.5-30V. To reach the best measurement accuracy, this voltmeter will automatically move the decimal points position according to the different measuring voltage. When it measures the voltage below 10V, it will display two places after the decimal point. When it measures the voltage above 10V, it will display one place after the decimal point. This voltmeter can be used to measure the storage battery's voltage in motorcycles and cars and also can grasp the storage batterys status. It also can be used to measure other voltage. 30V is the voltmeters maximum operating limited voltage, please leave enough margin when working, to avoid voltmeters permanent damage because of an electrical spark, power supply ripple, or other too high abrupt change of voltage. Very bight and decent LED Display is ready to measure the dc voltages in the range of 3.5V to 30V. Connections : Red Wire: source +ve terminal. Black Wire: Source -ve terminal. Note: The display weight and Dimensions may have2% error. Features : Very small and lightweight voltmeter module. Very handy and easy to use. Blue LED display. Dont need the external power supply because it is a self-powered version of this display. Best operates in the working voltage range of 5V to 24V 100% Brand new and high quality. Additional information Accuracy 0.1 V Color Blue Wires 2 Display ON Voltage (V) 2.5 Operating Voltage (VDC) 3.6 ~ 28 Current Consumption (mA) 15 Refresh Speed (ms) 200 (one time) Minimum Input (V) 3.6 Highest Input (V) 28 Operating Temperature (C). -10 to 60 Holes for Mounting 3 cm Height (cm) 0.72 cm Length (cm) 1.3 cm Width (cm) 3 cm Weight (gm) 3 gm Package Includes : 1 x 0.72 cm (0.28 inch) 3.5-30V Two Wire DC Voltmeter Blue * Product Images are shown for illustrative purposes only and may differ from actual product.
Out of stock24V 1.5A DC Power Supply Adapter Good Quality with 1 Year Warranty
[Adaptor Power Supply] The 24V 1.5A DC Power Adapter is a premium-quality SMPS-based regulated power supply designed to deliver a stable and reliable 24V DC output at 1.5 amps. Supporting a wide AC input range of 100–240V, this adapter works seamlessly with Indian power sockets without requiring any plug converter. Built with advanced switch-mode power supply (SMPS) technology, this adapter offers high efficiency, low ripple, low interference, and excellent voltage regulation. It ensures smooth and safe operation for sensitive electronic devices. Equipped with short-circuit, over-voltage, and over-current protection, the adapter protects both your equipment and the power supply from electrical damage. Its compact, lightweight, and center-positive design makes it perfect for continuous indoor use. Ideal for powering CCTV cameras, routers, networking equipment, LED lighting systems, access control systems, industrial electronics, and DIY projects, this adapter delivers high reliability and long-term performance, backed by a 1-year warranty. ⭐ KEY FEATURES ✔ Output: 24V DC, 1.5A stable regulated supply✔ Wide Input Range: AC 100–240V, 50/60Hz✔ SMPS Technology – High efficiency & low heat✔ Built-in Short Circuit, Over-Voltage & Over-Current Protection✔ Center Positive Output✔ Indian Plug Design – No converter required✔ Compact, lightweight & portable✔ Low ripple, low noise & high reliability✔ 1-Year Warranty 🔧 TECHNICAL SPECIFICATIONS Input Voltage: AC 100–240V, 50/60Hz Output Voltage: DC 24V Output Current: 1.5A Output Power: 36W (Approx.) Output Type: DC, Single Output Polarity: Center Positive Category: Switch Mode Power Adapter (SMPS) Efficiency: High, low energy consumption Warranty: 1 Year 🎯 APPLICATIONS CCTV cameras & DVR systems Routers & networking equipment LED strips & lighting systems Access control systems Industrial control panels DIY electronics & embedded projects 📦 PACKAGE INCLUDES 1 × 24V 1.5A DC Power Supply Adapter * Product Images are shown for illustrative purposes only and may differ from actual product.
Out of stock6S 18650 Li-Po Lithium Battery Capacity Indicator Module
[Li-Ion Capacity Indicator] This battery type capacity indicator module display shows the display is more intuitive and more beautiful. A wider range of applications, nickel-metal hydride batteries, 18650 and polymer lithium battery packs, lead-acid storage, electric vehicle batteries, electric equipment can be used. This display has a reverse connection function, even if the positive and negative connection will not burn. To use the display just connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test. The digital tube will display the real-time battery power. Features :- Battery type of electricity quantity display. Wide application fields: lithium battery. Using Method: connect display board positive and negative port with tested battery positive. and negative port, the digital tube will display real-time battery electricity quantity. Digital Color: outline red, display block blue (when the battery electricity quantity is full, it will be all on). Specs: Input Supply Voltage: 19.8 ~ 25.2VDC Colour Display Reverse Connection Protection Wide Variety of applications Length: 41 mm Width: 20 mm Approx Weight: 5 gm Application: Battery pack Consumer electronics product 22.2V voltage rating Power supply Power bank and charger Package Includes :- 1 X 6S 18650 Li-Po Lithium Battery Capacity Indicator Module * Product Images are shown for illustrative purposes only and may differ from actual product.