3S 100A BMS – 12V Three-Cell Lithium Battery Protection Board with Balance Charger
This 3S 100A Battery Management System (BMS) is engineered for 12V lithium battery packs assembled from three series-connected 3.7V cells. It delivers reliable, continuous protection for battery packs used in inverters, solar energy storage, electric lighting, e-bikes, and other high-current DC applications.
The board handles up to 100A of continuous discharge current and 200A instantaneously, making it well-suited for motor-starting loads and heavy-duty setups. Its split-port design separates the charge path from the discharge path, allowing cleaner circuit integration and safer simultaneous charge-discharge operation.
Protection functions cover all critical failure modes: overcharge protection triggers at 4.25V ±0.025V per cell, over-discharge protection activates at 2.80V ±0.05V per cell, and short-circuit protection is built in. Balanced cell charging ensures all three cells stay at matched voltage levels throughout each charge cycle, which directly improves long-term capacity retention.
Built on a robust PCBA with a thickened 2OZ copper layer, enlarged aluminum heat sink plate, and high-power MOS transistors on both sides, this board is designed to handle sustained current loads without overheating. A balance connector port is included for external monitoring or thermal switch integration.
At 56×86×9mm and just 80g, it is compact enough to fit inside most custom battery enclosures while providing industrial-grade protection and reliability.
Package Contents
1 × 3S 100A BMS Lithium Battery Protection Board (with aluminum heat sink)
1 × Balance/connector wire harness (multi-pin connector cable)
