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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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.

Project Min. Typ. Max. Units
Consuming current 12 18 24 uA
Overcharged protection voltage 4.2 4.25 4.3 V
Balanced starting voltage 4.17 4.2 4.23 V
Equilibrium current 95 100 105 mA
Balanced heating power 1.56 1.72 1.91 W
Overcharge recovery voltage 4.1 4.15 4.2 V
Over-discharge protection voltage 2.4 2.5 2.6 V
Overvoltage protection after over-discharge protection 2.8 3 3.2 V
Overvoltage protection after over-discharge protection 3.2 3.5 3.8 V
Over-discharge recovery voltage 2.9 3.2 3.3 V
Conduction internal resistance 2.5 3 3.5 mQ
Overcurrent protection current C 70 80 90 A
Overcurrent delay time 100 150 200 ms
Continuous operating current 0 40 40 A
Continuous output power 0 672 672 W
Ambient temperature -40 25 85 °C

Fault phenomenon Fault check and cause The solution
Unable to charge Measuring the voltage of 4 groups of batteries. 
when 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 discharge Measuring the voltage of 4 groups of batteries. 
when 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 miswired Rewire or replace the new board 
(human failure, no warranty)
OV, 4.2V, 8.4V, 12.6V, 16.8V miswired Rewire or replace the new board 
(human failure, no warranty)
Discharge protection Check 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 soldering There is no connection between one of the components 
and the PCB pad.
Repair welding
Component welding There is a short circuit between two or more pins of the 
Remove the component and re-weld
Electrostatic breakdown A In 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 B Remove 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 

Additional information

Weight 0.05 kg


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