Standard version:suitable for starting current below 60A,power 100W below the drill.(Not balanced function) Enhanced version:for starting current below 80A,power 135W below the drill.(Not balanced function) Balanced version:suitable for starting current below 80A,power 220W below the drill.(with balance) Note 1:The successful start of the drill requires three 15C-20C power battery,or six 10C-15C power battery(ordinary 18650 can not start the drill!). Note 2:strictly according to map wiring 0V,4.2V,8.4V,12.6V,16.8V,do not deliberately short circuit. Note 3:When the load of the brush motor is used,try to connect a non- 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. Note 4:4 groups of batteries in series,please that the voltage of each group of batteries,if not the same,please fill each battery separately and then use in series.The The Discharge test,the voltage drop faster battery that group is poor battery. Model Number:Lithium Battery 18650 Charger PCB Protection Board Condition: is customized:Yes Type:Voltage Regulator Application:For Drill Motor Balance Current :100mA 4S 16.8V 40A lithium battery protection board Scope:Nominal voltage of 3.6V,3.7V lithium battery(including 18650,26650,polymer lithium battery) 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 Color:green Material:plastic+metal Package Contents: 1* 4S 40A Li-ion Lithium Battery Protection Board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.