The 3S 40A 12V Lithium Battery Protection Module (BMS) with Balancing is a higher-current battery management circuit for 3-series (11.1V/12.6V) lithium-ion or Li-Po packs, protecting against overcharge, overdischarge, and overcurrent while balancing all three cells during charging. Its larger MOSFET bank suits higher-drain packs such as those used in power tools and e-bikes.
Key features:
- Overcharge/Overdischarge Protection: Automatically disconnects the pack when any cell exceeds its safe voltage window.
- Passive Cell Balancing: Bleeds excess charge from higher-voltage cells so all three stay closely matched.
- 40A Continuous Current: An expanded MOSFET bank supports sustained discharge currents up to 40A.
- Short-Circuit Protection: Cuts off the output instantly if a short circuit is detected on the load side.
- Compact Green PCB: A small footprint fits neatly inside battery packs and power tool housings.
- Simple Wiring: Labeled pads for each cell tap plus main positive and negative terminals simplify installation.
Wire each cell tap to its matching pad in series order and route the pack’s main leads through the P+ and P- terminals to keep a higher-drain 3S lithium pack protected during charge and discharge.
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