best battery Protections and extend life with our Lithium Iron Phosphate Protections Board, designs to support Multiple lithium battery packs with a maximums continuous current of 20A. Featuring overcharge, over discharges , and short Circuits Protections, this board intelligently balances Voltages for enhances battery pack stability. for electronic engineers, electric vehicle enthusiasts, and battery pack users who prioritize safety and Performances. Perfectly suited for applications in electric bicycles, power tool , and energy storage devices where stable power management is vital This Protections board is crafted from plastic, making it a reliable choice for those search efficient power solution in demanding environment Type:B: 4S30A Size:about 5x5cm/1.97x1.97inch Color:As Shown Material:PCB+Metal Package Contents: 1 * Battery Protection Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.