BMS 3S 20A. BALANCED 3S BATTERY CHARGER
18650 PCB
Nominal Voltage: 3.6V 3.7V / cell
Charging Voltage: 12.6V
Maximum Output Current: 20A
Maximum Output power/charging power: 252W
Product Size: 64mmx20mmx3.4mm
3S 12V 20A BMS Lithium battery protection board is used to protect the battery from being over-discharged or over-charged during use, resulting in battery damage. 3S BMS is used for 18650 Type cells which have voltage 3.7v to 4.2.
 
Precautions:
1.Strictly according to the diagram wiring: 0V/4.2V/8.4V/12.6V,Otherwise it will cause damage to the chip.
2.After connection,it need to first charge activation, then will have the output.
Attention:
Do not mix the good battery and poor battery to use.
The internal resistance of 3 battery capacity are closer will be better.