Module name: 3S 12.6V Li-ion Lithium Battery 18650 Charger Protection PCB BoardSuitable range: For nominal voltage 3.6V 3.7V lithium battery(Including 18650,26650, lithium polymer batteries)Product Size: 64mmx20mmx3.4mmMaterial:MetalCharging voltage: 12.6VMaximum output current: 20AMaximum output power / charging power: 252WPrecautions: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.Please buyers know the professional knowledge of this module before buying