Description
Features:
- 4S 16.8V 40A 18650 lithium battery protection board (comes with recovery function-AUTO Recovery)
- Integrated 10 low load resistance MOS tube, continuous discharge 40A, 100mA balanced current, for electric drill/sprayer/LED lights/low power inverter
- 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
- Scope: Nominal voltage of 3.6V, 3.7V lithium battery (including 18650,26650, polymer lithium battery)
- Charging voltage: 16.8V - 18.1V
- Balanced version: suitable for starting current below 80A, power 135W below the drill (with balance)
- Board Size: approx. 46*60*3.4mm
project | Minimum | Typ. | Maximum. | Units |
Current consumption | 12 | 18 | 24 | μA |
Overcharge 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 |
Overload protection voltage | 2.4 | 2.5 | 2.6 | V |
Overvoltage protection after overload protection | 2.8 | 3 | 3.2 | V |
Overvoltage protection after overload protection | 3.2 | 3.5 | 3.8 | V |
Discharge recovery voltage | 2.9 | 3.2 | 3.3 | V |
Internal conductivity resistance | 2.5 | 3 | 3.5 | mec |
Overcurrent protection current C | 70 | 80 | 90 | A |
Overcurrent delay time | 100 | 150 | 200 | RS |
Continuous working current | 0 | 40 | 40 | A |
Continuous power output | 0 | 672 | 672 | W |
Ambient temperature | -40 | 25 | 85 | ° C |
>td >Repair by welding
Bug fix: |
||
Malfunction phenomenon | Fault check and cause | Decision |
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. |
Connect the battery well, don't mix good battery and bad battery. |
Impossible to discharge | Measuring the voltage of 4 groups of batteries. When one of the battery voltages is below 2.7V, the protection board will activate over-discharge protection. |
Connect the battery well, don't mix good battery and bad battery. |
Charge / discharge failure |
OV, 4.2V, S.4V, 12.6V, 16.8V are incorrectly connected | Remount or replace a new board (human error, no warranty) |
Overcharge / overdischarge failure |
OV, 4.2V, 8.4V, 12.6V, 16.8V not properly connected | Remount or replace a new board (human error, no warranty) |
Discharge protection | Make sure the battery is sufficiently discharged. power and ensure that the inrush current of the load exceeds the current of the overcurrent protection board. |
Replace the battery with a more powerful discharge capacity, or a high current protection plate (super working range) |
Soldering components | and the PCB pad. | |
Welding components | A short circuit between two or more contacts is an integral part. |
Remove component and re-weld |
Electrostatic breakdown A | In the off state, measure the G, D and S poles of the MOSFET. If the forward and backward resistance of any two pins is 0Q, this indicates that it has broken. |
Remove the new MOS tube. |
Electrostatic breakdown B | Remove the MOS tube and measure the resistance. poles G and D, G and S tube MOS. If there is resistance indicating that it has broken down the resistance should be infinite. |
Remove the new MOS tube. |
Package includes:
1 x Battery Protection Board

4s Bms 4s 40a Bms Li-ion Battery Protection Board Balanced Version In Pakistan
Rs.372