Battery 101


3s Li-Ion 20A 12.6V protection board

3s Li-Ion 20A 12.6V Protection board is a small PCB mounted Lithium Battery protection module. This small and smart protection module comes with various features like Short-circuits, Over-charge, Over-discharge and Over-current protection. It is straight forward to install and convenient to use in all your DIY portable projects.

Suitable for lithium-ion cells in a 12.6V (max Voltage) 3s configuration.


  • Model: 3S Li-ion – 11.1V-12.6V
  • Over-Charge protection: 4.2V-4.25V
  • Over-Charge recovery voltage: 4.1-4.15V
  • Over-Discharge protection: 2.5V-2.6V
  • Over-Discharge recovery: 2.8V-3.2V
  • Over-Current Protection: 60A
  • Cont. Working Current: 20A
  • Static current: less than 18uA
  • Internal Resistance: Less than 14mΩ
  • Operating Temperature: -10℃ -50℃
  • Size: Approx.: 59 x 20 x 4mm

Package included: 1 x Li-ion Battery 3S 20A Protection board.



These BMS protection modules may arrive "Activated".  Apply 12.6V across the charge/load terminals will reset the board.  If after assembling your pack, you have zero volts at the PCB terminals or if you've shorted the PCB terminals, connect 12.6V to the charge/load terminal will reset the board.



This BMS will require a competent and knowledgeable person with an electronic background and skills to install and operate. As these are sensitive products, we will only accept returns if its un-opened and un-used. 

Please double check and triple check your wiring, especially the balance/sense wires are correct. Even temporary incorrect wiring may damage this device.

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