The DIY Lithium Battery Charger Board TP4056 is a compact, single-cell lithium battery charging module designed for DIY electronics projects, battery-powered devices, and portable applications. Built around the TP4056 charging IC, this board provides a complete, constant-current/constant-voltage linear charging solution for 3.7V lithium-ion and lithium-polymer batteries, with a maximum charge current of 1A and convenient extended contacts for easy integration.
At the heart of the board is the TP4056, a complete single-cell lithium battery charger with constant-current/constant-voltage (CC/CV) charging architecture. The charging voltage is fixed at 4.2V, and the charging current is programmable via an external resistor (preset to 1A on this board). The TP4056 also includes thermal regulation to prevent overheating during high-current charging and charge status indication through onboard LEDs.
The board features extended contacts — solder pads or through-hole points that allow you to easily connect the battery, input power, and output load. This makes the module ideal for embedding into custom projects where the charger is integrated directly into the device rather than used as a standalone module. The Mini USB input provides a standard, widely compatible connection for power, and the board includes protection against reverse polarity on the input.
Important Note: This is an unprotected version. It does not include battery protection circuitry (over-discharge, over-current, or short-circuit protection) for the battery. For applications requiring battery protection, an additional protection module (such as the TP4056 with DW01 protection IC) should be used between the battery and the load. This unprotected version is best suited for applications where the battery already has built-in protection or where the load is carefully managed.
The board includes two onboard LEDs for charge status indication: a red LED indicates charging in progress, and a blue or green LED indicates charge complete. The module operates from a 4.5V to 5.5V DC input (typically 5V from USB) and provides a maximum charge current of 1A (programmable via resistor).
The TP4056 charger is widely used in DIY power banks, portable electronics, wearable devices, IoT sensor nodes, and battery-powered projects. Its compact size, simple operation, and low cost make it an essential component for any lithium battery project.
Whether you are building a custom power bank, adding battery charging to a portable device, or learning about lithium battery management, the TP4056 Charger Board provides a reliable, cost-effective foundation. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.
Features
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TP4056 charging IC — Complete single-cell lithium battery charger
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1A maximum charge current — Programmable via external resistor
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Constant-current/constant-voltage charging — Safe, reliable charging profile
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4.2V fixed charging voltage — Standard for lithium-ion and lithium-polymer batteries
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Mini USB input — Standard, widely compatible power connection
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Extended contacts — Solder pads for easy integration into custom projects
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Charge status LEDs — Red (charging) and blue/green (charge complete)
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Thermal regulation — Prevents overheating during high-current charging
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Input reverse polarity protection — Protects the charger from accidental polarity reversal
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Unprotected version — Requires external battery protection for over-discharge protection
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Charging IC | TP4056 |
| 2 | Input Voltage | 4.5V – 5.5V DC (5V typical via Mini USB) |
| 3 | Charging Voltage | 4.2V ±1% |
| 4 | Maximum Charge Current | 1A (programmable) |
| 5 | Charging Method | Constant-Current / Constant-Voltage (CC/CV) |
| 6 | Indication | Red LED (charging), Blue/Green LED (complete) |
| 7 | Input Connector | Mini USB |
| 8 | Board Dimensions | Compact form factor with extended contacts |
