This compact 3S 10A Lithium-Ion Battery BMS Protection Board is specifically designed to manage and safeguard 3-cell 18650/21700 battery packs. Measuring just 54mm x 18mm, this space-saving module provides a continuous 10A current and comprehensive 11.1V to 12.6V protection against overcharging, over-discharging, overcurrent, and short circuits. It features clearly labeled dual-side solder pads (0V, 3.7V, 7.4V, 11.1V), making it the ideal choice for compact DIY electronics, portable power banks, low-power tools, and LED lighting projects.