Description
Product Overview
The 3.7V 1A Ultra-Slim Compact Li-ion Battery Charger Module is a complete, highly efficient charging solution designed specifically for single-cell 3.7V lithium-ion and lithium-polymer (LiPo) batteries. This ultra-compact module combines a reliable TP4056 charging IC with DW01 battery protection circuitry—offering both charging management and essential battery safety features in an extremely slim form factor.
Based on the industry-standard TP4056 linear charging IC from Top Power ASIC, this module implements a proper Constant Current/Constant Voltage (CC/CV) charging algorithm that is essential for lithium battery safety and longevity. It charges 3.7V nominal batteries to the correct full charge voltage of 4.2V with an accuracy of ±1.5%.
What sets this module apart is its integrated DW01A battery protection IC and FS8205A dual MOSFETs, which provide comprehensive protection against overcharge, over-discharge, overcurrent, and short circuits. The “with protection” version is ideal for standalone 18650 cells and other batteries that lack their own built-in protection circuit.
The modern USB Type-C input allows convenient charging via standard USB chargers, power banks, or computer USB ports, while alternative solder pads (IN+/IN-) provide DIY wiring flexibility. The ultra-slim PCB size makes it perfect for portable electronics, DIY power banks, Arduino/ESP32 battery-powered projects, and replacing dead charger circuits in consumer devices.
Key Features
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Integrated Protection Circuit: Includes DW01A battery protection IC and FS8205A dual MOSFETs, providing overcharge protection (4.28V cutoff), over-discharge protection (3.0V cutoff), overcurrent protection (3A), and short-circuit protection
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USB Type-C Input: Modern reversible connector for easy connection to standard USB chargers, power banks, or computer USB ports
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1A Maximum Charge Current: Default charging current of 1000mA (1A), adjustable by changing the programming resistor for lower current applications
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CC/CV Charging Algorithm: Proper Constant Current / Constant Voltage charging method essential for lithium battery safety and longevity
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Ultra-Slim Compact Design: Extremely low-profile PCB (approx. 3-4mm thickness) allows for integration into tight spaces and slim portable devices
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Dual-Color Status Indicator: Red LED indicates charging in progress; Green/Blue LED indicates fully charged or no battery connected
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Alternative Power Input Pads: IN+ and IN- solder pads allow custom 5V wiring for DIY projects when Type-C is not available
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Thermal Regulation: Automatically reduces charge current if internal die temperature exceeds safe limits, protecting the chip during high-current charging
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Input Voltage | 4.5V – 5.5V DC (5V typical) |
| Recommended Input Voltage | 5V |
| Full Charge Voltage | 4.2V ±1.5% |
| Maximum Charge Current | 1A (1000mA) default |
| Overcharge Protection Voltage | 4.28V |
| Over-Discharge Protection | 3.0V (cutoff) |
| Over-Current Protection | 3A (typical) |
| Charging Accuracy | ±1.5% |
| Operating Temperature | -10°C to +85°C |
| Charging Method | Linear (CC/CV) |
| Dimensions (approx.) | 29mm × 17mm × 4mm |
| Weight | Approx. 3g |
| Input Interface | USB Type-C (plus IN+/IN- pads) |
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