BMS voltage cut of   10.1 v Charging is 12.6 to 18v is ok NOTE:01 1) This board is not suit high power electronic tools, if use for screwdriver and drill,electric bike series make,fishing machine , please don't buy this. Pcb Bms For Drill Motor 11.1V 12.6V Lipo Cell Module BMS activate method : Use 12.6V Li-ion  charger to charge it Scope: Nominal voltage of 3.6V, 3.7V lithium battery (including 18650,26650, polymer lithium battery) Product Size: 42 * 60 * 3.4mm (balanced version) Product weight: 9.8g (balanced version) Charging voltage: 12.6V - 13.6V 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 Balance version: suitable for starting current below 80A, power 135W below the drill. Note 02 : try not to put a good battery and poor battery mixed together! Note 03 When the load of the brush motor is used, try to connect a non-polar capacitor (withstand voltage above 25V, capacity 10uF-100uF) to the motor's positive and negative terminals to prevent the reverse spike from the motor. Break the MOS tube.