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3S Battery Protection Board (BMS) 20A 12.6V

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Product Description

A BMS is a battery management system often used in a medium or large format lithium-ion battery pack. A BMS is a circuit board that provides protection, monitoring, balancing, and other high-level functionality for a battery pack.


  • Continuous discharge current (upper limit): 20A (if the cooling environment is not good, please reduce the load current use)
  • Continuous charge current (upper limit): 10A
  • Charging voltage: 12.6V - 13.0V
  • Nominal voltage cell of 3.6V, 3.7V lithium battery (including 18650,26650, polymer lithium battery)
  • Dimensions: 59 x 20 x 3.4mm


  1. Connect strictly according to map wiring 0V, 4.2V, 8.4V, 12.6V, do not deliberately short circuit. 
  2. When a motor brush is used, try to connect a non-polar capacitor (withstand voltage above 25V, capacity 10uF-100uF) to the motor's positive and negative terminals to prevent the reverse spike from the motor.

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