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

- China

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Main Features


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.

Consuming current121824uA
Overcharged protection voltage4.24.254.3V
Balanced starting voltage4.174.24.23V
Equilibrium current95100105mA
Balanced heating power1.561.721.91W
Overcharge recovery voltage4.14.154.2V
Over-discharge protection voltage2.42.52.6V
Overvoltage protection after over-discharge protection2.833.2V
Overvoltage protection after over-discharge protection3.23.53.8V
Over-discharge recovery voltage2.93.23.3V
Conduction internal resistance2.533.5mQ
Overcurrent protection current C708090A
Overcurrent delay time100150200ms
Continuous operating current04040A
Continuous output power0672672W
Ambient temperature-402585°C

Fault phenomenonFault check and causeThe solution
Unable to chargeMeasuring the voltage of 4 groups of batteries. 
If one of the battery voltages exceeds 4.25V, 
the protection board will activate overcharge protection.
Pair the battery pack well, do not mix 
the good battery and the bad battery.
Unable to dischargeMeasuring the voltage of 4 groups of batteries. 
If one of the battery voltages is lower than 2.7V, 
the protection board will activate the over-discharge 
Pair the battery pack well, do not mix 
the good battery and the bad battery.
OV, 4.2V, S.4V, 12.6V, 16.8V miswiredRewire or replace the new board 
(human failure, no warranty)
OV, 4.2V, 8.4V, 12.6V, 16.8V miswiredRewire or replace the new board 
(human failure, no warranty)
Discharge protectionCheck that the battery pack has sufficient discharge 
capability and check that the load's starting current 
exceeds the overcurrent protection current of the 
protection board.
Replace the battery pack with a higher 
discharge capacity, or a protective 
plate with a larger current 
(super working range)
Component solderingThere is no connection between one of the components 
and the PCB pad.
Repair welding
Component weldingThere is a short circuit between two or more pins of the 
Remove the component and re-weld
Electrostatic breakdown AIn the unpowered state, measure the G, D, and S 
poles of the MOSFET. If the forward and reverse 
resistances of any two pins are 0Q, 
it indicates that it has broken down.
Remove the replacement MOS tube
Electrostatic breakdown BRemove the MOS tube and measure the resistance 
of the G and D, G and S poles of the MOS tube. 
If there is a resistance indicating that it has broken 
down, the resistance should be infinite.
Remove the replacement MOS tube

Package includes:

1 x Battery Protection Board 


Voltage Regulator
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