This is a 4S 18650 lithium battery charger protection board for 18650 cells and other Li-ion batteries. You can use this 4S BMS in the electric vehicle, hoverboard, drill machine, and other Lithium battery-operated products.
4S 16.8V 40A lithium battery protection board
Scope: Nominal voltage of 3.6V, 3.7V lithium battery (including 18650,26650, polymer lithium battery)
Product Size: 45 * 55 * 3.4mm
Charging voltage: 16.8V - 18.1V
Continuous discharge current (upper limit): 40A (if the cooling environment is not good, please reduce the load current use)