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5S Battery Protection Board (BMS) 15A 21V

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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): 15A (if the cooling environment is not good, please reduce the load current use)
  • Continuous charge current (upper limit): 20A
  • Charging voltage: 21v
  • Nominal cell voltage of 3.6V, 3.7V lithium battery (including 18650,26650, polymer lithium battery)
  • Dimensions:  


  1. Connect strictly according to map wiring 0V, 4.2V, 8.4V, 12.6V, 16.8V, 21V, 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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