This module adopts the TI dedicated battery charging chip BQ25606 voltage reduction scheme, with high output efficiency, stable performance, and over charge and over discharge protection. Type-C Interface input, input voltage range 4.5-12V, output current MAX up to 3A, very suitable for nominal 3.7V lithium battery charging. The board is equipped with a red LED charging indicator light and a blue LED status indicator light, which can visually observe the charging status of the module and battery.

Module type: Step-down power supply
Input voltage: DC 4.5-12V
Charging cut-off voltage: 4.2V ± 1%
MAX charging current: 3000mA
Battery over discharge protection voltage: 2.8V
Battery overcharge protection voltage: 4 2 ± 0.05V
Module interface: solder pads (can also be connected to 2.54mm pins)

NTC: (default does not use thermistors) Connect a thermistor with a negative temperature coefficient. When the thermistor detects that the battery temperature exceeds the range of 0 ° C to+60 ° C, charging pauses. Recommend 103AT-2 thermistor. Attention: When connecting the thermistor, it is necessary to modify the resistance value of the voltage divider, namely R1 and R2 above. R1 should be changed to 5.23K and R2 should be changed to 30.1K

When connecting the battery for the first time, there may be no voltage output at the U-end, and it is necessary to charge it with 5V at the power input to activate the protection circuit. When using a mobile phone charger for power supply, it must be able to output 1A or more, otherwise it may cause abnormal charging.
The module is not designed for high power, but is suitable for charging the vast majority of nominal 3.7V lithium batteries. Therefore, when using it, do not exceed the tested limit values, especially the load current. It is recommended to work below 2A, and add heat sinks for cooling above 2A.