TP4056 1A Charging Module Without Protection for 3.7V Li-ion Battery

The TP4056 1A Li-Ion Lithium Battery Charging Module with Micro B USB is a 3.7V lithium battery charger that features an onboard Micro USB interface. You can directly connect it to a computer’s USB port for battery charging. If a USB port is not available, you can use an external voltage source at the IN+/IN- pads, which is ideal for DIY projects. The module is compact and lightweight.

Additionally, the TP4056 module includes a current monitor, under-voltage lockout, automatic recharge, and two status pins to indicate charge termination and the presence of an input voltage.

Note: 

1. This breakout board does not have overcurrent protection.
2. Connect Ampere meter in series with 5V input end.
3. The charging current is best to be 0.37 times of the battery capacity,
4. Charging wire can’t be too thin or too long while interfacing.
5. Make sure the board has good contact with the battery.
6. Chip at work about 60 degrees fever is normal.
7. Input reverse connection has no effect on the chip. Rather the output (battery’s) reverse connection will burn out the chip.