The Milwaukee MXFXC406 MX Lithium-Ion MXFXC406 Battery Pack provides you with maximum power and runtime for all of your MX FUEL equipment in a compact profile, making MX FUEL equipment solutions the most powerful in the industry. MX FUEL REDLITHIUM is the hardest working, most reliable power for equipment. REDLINK Intelligence allows the battery to communicate with MX FUEL equipment in application to optimize performance. This battery pack delivers fade-free power, running cool, even through heavy applications. This lithium-ion battery is capable of fully charging in 90 minutes. An onboard fuel gauge displays the remaining charge with the push of a button. Thick rubber over-mold provides protection for the battery if dropped. This pack is ONE-KEY Compatible. With ONE-KEY, track, manage and secure equipment from your mobile device or computer using the industrys largest Bluetooth community tracking network. If ever lost or stolen, prevent tampering with remote lockout capability.