The MILWAUKEE 12-Volt Extended Capacity Battery Pack and Charger are compatible with all M12 power tools and instruments. The M12 REDLITHIUM XC extended-capacity battery delivers 4 Ah of run time-even in sub-zero temperatures. The 12-Volt lithium-ion battery pack features REDLINK Intelligence, engineered to prevent overloads and protect against cell-damaging discharge. This 12-Volt battery has revolutionary cell monitoring and temperature regulation that prolong the battery's operation and life expectancy for fewer work interruptions and more recharges than ever.