3S 40A Lithium Battery BMS Protection Board (Enhanced)
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Prices updated: 13 Oct 2026
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About this product
A battery management board for 3-cell (3S) lithium-ion packs with a nominal range of 11.1V to 12.6V. It protects against overcharge, over-discharge and short-circuit conditions, and uses passive cell balancing with a rated current of up to 40A. It is used in e-bike packs, power tool batteries and DIY battery builds. It is a protection board, not a charger.
Specifications
- Cell configuration
- 3S (3 cells in series)
- Nominal voltage
- 11.1 V to 12.6 V (3S Li-ion)
- Max current
- Up to 40 A
- Balancing
- Passive cell balancing
- Protection
- Overcharge, over-discharge, short-circuit
Frequently asked questions
How do I wire the balance leads to a 3S pack?
Connect B- to the pack's negative terminal, then connect the balance leads in order to the junctions between cells, ending at B+ on the pack's positive terminal. Check the labels on your board before wiring.
Can this board be used with a 4S pack?
No. This board is designed for 3-cell packs only. Use a 4S board for 4-cell lithium-ion packs.
