The 3S 10A 12V 18650 Lithium Battery Charger Board Protection Module is designed to safeguard 3 series lithium-ion battery packs (11.1V nominal, 12.6V full charge). It provides overcharge, over-discharge, overcurrent, and short-circuit protection, ensuring safe and efficient battery performance. Ideal for DIY battery packs, power tools, LED lighting, and small electric devices.