BMS 4S 40A Charger BMS Protection Board Lithium Battery 18650

4 string 16.8V 40A lithium battery protection board (comes with recovery function-AUTO Recovery) Scope: Nominal voltage of 3.6V, 3.7V lithium battery (including 18650,26650, polymer lithium battery) Product Size: 45 * 55 * 3.4mm (Standard Edition / Enhanced), 46 * 60 * 3.4mm (balanced version) Product weight: 9.3g (standard / enhanced version), 10.3g (balanced version) 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) Continuous charge current (upper limit): 20A Equalization version: suitable for starting current below 80A, power 135W below the drill.