The BL4040F uses cells with lower internal resistance, delivering high peak power with less heat and improved autonomy due to lower energy loss during discharge. This battery is ideal for high-power applications where tool compactness and lightness are essential, such as angle grinders, circular saws, rotary hammers, and top-handle chainsaws. The Makita XGT 40Vmax Li-ion Battery is built for harsh environments with a robust, splash-proof construction and an integrated cooling system for maximum durability. It features an LED indicator for remaining capacity and a digital communication system between the tool, battery, and charger. This system optimizes charging based on battery status and allows the tool to adjust performance according to the battery level.