Product Type

Single Cell Li-Ion/LiPo Battery Charging Module

Main IC

TP4056 (Linear Charger IC) and often DW01A (Battery Protection IC)

Input Interface

Micro USB Port: Allows for direct connection to a standard 5V USB power source (e.g., phone charger, computer USB port). <br> IN+/IN- Pads: Alternative input terminals for direct 5V DC power supply connection.

Input Voltage Range

4.5V to 5.5V DC (Nominal 5V)

Battery Type Compatibility

Single Cell 3.7V Lithium-ion (Li-Ion) and Lithium Polymer (LiPo) batteries (e.g., 18650, 16550, various LiPo packs)

Charging Method

Linear Charging (CC/CV - Constant Current/Constant Voltage): Charges the battery first with a constant current until it reaches a certain voltage, then switches to constant voltage until fully charged.

Maximum Charging Current

1A (1000mA): The default charging current. This can often be adjusted by replacing a specific resistor (RPROG) on the board.

Charge Precision

pm1.5

Full Charge Voltage (Cut-off)

4.2V

Current Protection

Yes, Integrated: Often provided by an additional IC (like DW01A) and a dual MOSFET (e.g., FS8205A).

Overcharge Protection

Prevents the battery from being charged beyond its safe voltage limit (e.g., typically cuts off at 4.3V and resumes at 4.1V).

Over-Discharge Protection (Under-Voltage Cut-off)

Prevents the battery from being discharged below a critical voltage, which can damage the battery (e.g., cuts off load at 2.4V and resumes at 3.0V).

Overcurrent Protection

Cuts off output if discharge current exceeds a safe limit (e.g., typically around 3A).

Short-Circuit Protection

Protects the circuit and battery from damage in case of a short circuit on the output.

Reverse Polarity Protection

NO (Input/Battery Connection): Important! Most TP4056 boards do NOT have reverse polarity protection on the battery input. Connecting the battery backward will likely damage the module.

Indicator LEDs

Red LED: Indicates charging in progress. <br> Green/Blue LED: Indicates charging is complete.

Output Terminals

B+/B- Pads: For connecting the battery to be charged. <br> OUT+/OUT- Pads: For connecting a load (the device powered by the battery). Note: It's generally recommended to disconnect the load during charging for safety and optimal charging performance.

Trickle Charge Function

If the battery voltage is very low (e.g., below 2.9V), the module will start charging with a small "trickle" current (e.g., 130mA) to safely bring the voltage up before switching to full current.

Automatic Recharge

If the battery voltage drops below a certain threshold after being fully charged, the module may automatically restart the charging cycle.

Dimensions (Typical)

Small and compact, often around 25mm x 19mm x 10mm (L x W x H) or similar.

Operating Temperature

-10°C to +85°C

Advantages

Low cost, small size, reliable charging, integrates essential safety features, widely available, easy to use with common USB power sources.

Limitations

Only for single-cell LiPo/Li-Ion batteries, no reverse polarity protection on battery input, should ideally disconnect load during charging.