The Vevor 20V 4.0Ah lithium-ion battery pack is a high-capacity replacement battery designed for Vevor 20V cordless power tools. It delivers stable power output with up to 40A max output current for demanding applications. Premium battery cells help extend runtime and reduce the need for frequent recharging. Built-in safety protections help guard against overcharge, over-discharge, and short circuits. This battery is intended as a reliable replacement or upgrade for compatible Vevor 20V tools.