The 6S 40A 18650 Lithium Battery Protection Board is designed for 22.2V (25.2V fully charged) 6-series lithium-ion battery packs. It provides essential protection features such as overcharge, over-discharge, overcurrent, and short-circuit protection to ensure battery safety and longevity. With a high 40A discharge capacity, it is ideal for high-power applications like electric tools, e-bikes, and DIY battery packs.