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TP4056 Lithium Battery Charge/Discharge Protection Module [0805 Package - A Must-Have for Those with Clumsy Hands]

Overview

[Verified] After the indicator light changed and the power was disconnected, the battery electromotive force was measured to be 4.135V. Because the battery box was directly soldered to the module, the internal resistance is extremely high (approximately 200mΩ). The battery was detected as fully charged at 4.1V. Batteries with spot-welded wires did not have this problem.
The constant current charging current can be modified by changing the value of R5. The current and resistance correspondence is shown in the diagram below.

Parallel connection effect has not been tested and is not recommended. The 4056 module generates a lot of heat at 1A charging. I added a small heatsink, and the heat generation is much better at 500mA.
The charging cutoff voltage is 4.2V, which does not support 4.35V high-voltage batteries, and the cutoff voltage cannot be modified.

Design Files

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Update:2026-03-26 14:48:26

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