Charger Li-ion BMS-4S-40A-16.8V Lithium Battery 18650 Charger Li-ion PCB BMS with Balancer

4S 40A Li-ion Lithium Battery 18650 Charger PCB BMS Protection Board with Balance For Drill Motor 14.8V 16.8V Lipo Cell Module

Integrated 10 low resistance MOS tube load, 40A continuous discharge, 100mA balanced current, for electric drill / sprayer / LED lights / low power inverter.

4S 16.8V 40A lithium battery protection board

Scope: Rated 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 to use)

Continuous charge current (upper limit): 20A


Balanced Version: suitable for starting current below 80A, power 220W under the drill. (With balance)

Enhanced version Purchase link: Please click here



Note 1: The successful start of the drill requires three 15C-20C battery power, or six 10C-15C battery power (ordinary 18650 can not start the drill !!).


Note 2: Strictly according to the wiring map 0V, 4.2V, 8.4V, 12.6V, 16.8V, not deliberately short circuit.


Note 3: When the brush motor load is used, try to connect a non-polar capacitor (withstand voltage above 25V, capacitance 10uF-100uF) to the motor of the positive and negative terminals to prevent the reverse spike from the engine. Break the MOS tube.

Note 4: 4 groups of batteries in series, please make sure the voltage of each battery group, if not the same, please fill each battery separately and then use in series. Discharge test, the fastest battery voltage drop that group is low battery.

Package Include:
1 * 4S 40A Li-ion Lithium Battery Protection Board