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- 3S 12V BMS Protection: Safeguards 3-series Li ion packs with automatic cutoff for overcharge, overdischarge, short circuit, and overcurrent via 2 MOSFETs. - Broad Compatibility: Compatible with 18650 cells and DIY 3S battery packs for small projects, lighting, toys, power banks, and low-power electronics. - Simple Wiring: Labeled B+, B-, P+, P-, B1, B2 pads support straightforward connections and quick assembly. - Compact PCB Module: Slim, lightweight board fits tight enclosures; supports building or repairing 12V 3S packs for LED strips, backup power, RC projects, and portable speakers. - Use Notes: For Li ion chemistry only and moderate current draw; not intended for high‑drain tools or e‑bike systems.