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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

4.1

★★★★★

$1.40 /$1.71

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Feature:

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.
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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	mu03a9
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	u00b0C

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Troubleshooting:
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 protection.	Pair the battery pack well, do not mix the good battery and the bad battery.
Charging/discharging failure	0V, 4.2V, 8.4V, 12.6V, 16.8V miswired	Rewire or replace the new board (human failure, no warranty)
Overcharge/over-discharge failure	0V, 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 over-current 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 component.	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 0u03a9, 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