18650 Lithium Li-ion 3.7V 4.2V Battery Charger Board DC-DC Step Up Boost Module TP4056 DIY Kit

Description

The module can be roughly judged by two LEDs and other status of the working state, CHRG is red light, STDBY is blue light.

 Battery charging state red light is high, blue light is not bright, charge full bright blue light, red light is slightly bright. If there is a boost output, will be different according to the output power, there may be charging will always be high red light, not connected without load, blue light on, red light slightly bright. 

Change the resistance value of the resistor in the circle on the left to change the charging current, the resistor package is 0603, note that there is a risk of modification, such as problems, the store is not responsible. 

The following is the formula and examples. Charging current limiting resistor R = 1200/1 (l is the need to set the current), resistance value (K) 30, charging current (mA) 50. resistance value (K) 5, charging current (mA) 250. resistance value (K) 2, charging current (mA) 580 The module supports type-c interface input and the solder joint input marked on the back. 

Choose one of them, the recommended voltage is about 5V. Module marked with two outputs these two outputs are the same, the line is connected in parallel, you can choose one of the group on their own. The following focus on connecting the battery.