BMS 4 String 14.8V/40A

18650 Cell Lithium Battery Protection Board Current Peak 40A Over-Current Protection

250.00 EGP 250.0 EGP 250.00 EGP

250.00 EGP

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Internal Reference: BMS.4S.40A

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


  • Overcharge detection voltage: 4.28+ 0.05 V
  • Overcharging voltage: 4.2-4.3V
  • Over-discharge voltage: 2.5 ±0.08
  • Overcharge detection delay time 0.1s
  • Temperature range -40~85
  • Short circuit detection delay time: 100ms
  • Over-current detection delay time: 500 ms
  • Balanced current: 100mA
  • Working current: 40A
  • Overcurrent: 80A
  • Short circuit protection function: there is, a disconnect the load can be self-recovery.
  • Size: 60 x 45 mm

Main function:

Overcharge protection, over-discharge protection function, short circuit protection function, over current protection function, balance. 

Important Cautions:

  1. Strictly according to the diagram wiring - do not make short circuit.
  2. After the wire is connected, it needs to charge the batteries first, then have output.
  3. When the battery is connected in series with 5 groups, please ensure that the voltage of each battery is the same. If not the same, please fill in each set of batteries and then use them.
  4. Do not mix the good battery and the bad battery.
  5. It will be better if the capacity of the battery's internal resistance is closer.