Battery 101


2s Li-Ion 8A 7.4V Protection board

2s Li-Ion 8A 7.4V 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 an 8.4V (max Voltage) 2s configuration.


  • Model: 2S Li-ion – 7.4V-8.4V
  • Overcharge Detection Voltage: 4.2-4.25V
  • Over-Discharge Detection Voltage: 2.4-2.6V
  • Maximum Working Current: 8A
  • Transient Current: 16A
  • Operating Temperature: -10℃ -50℃
  • Static current: less than 10uA
  • Internal Resistance: Less than 100mΩ
  • B+ B-: The interface of the battery core
  • P+ P-: The connector of the battery board
  • MB: The connection point between the batteries
  • B+: Battery V+ Positive
  • B-: Battery V- Negative
  • P+: Output / Charging V+
  • P-: Output / Charging V-
  • Size: Approx.: 40.8 x 9 x 2.2mm

Package included: 1 x Li-ion Battery 2S 8A Protection board.



These BMS protection modules may arrive "Activated".  Apply 8.4V 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 8.4V 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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