BMS 3S (12.6V – 40A) Lithium Battery Protection Module ( Balanced Version)

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3S 40A BMS 11.1V 12.6V 18650 lithium battery protection Board with balanced Version for drill 40A current


  • Overvoltage range: 4.25 ~ 4.35v ± 0.05v
  • Over-discharge voltage range: 2.9 ~ 3.3v±0.05v
  • Maximum operating current: 0 ~ 40A
  • Overcurrent protection current: 70 ~ 90A
  • Quiescent current: less than 24uA
  • Working temperature: -40 +85 C
  • Short circuit protection: Yes, delayed self-recovery
  • Size: 60mm x 41mm x 1.2mm (LxWxH)


  • Strictly according to the diagram wiring, Do not deliberately short circuit.
  • After the wire is connected, it needs to charge the batteries first, then have output.
  • When the battery is connected in series with 3 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.
  • Do not mix the good battery and the battery.
  • It will be better the capacity of the battery internal resistance is closer.+


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