Product details:

Compatible with all Milwaukee M12 cordless tools and instruments, the M12 REDLITHIUM XC extended-capacity battery delivers 4 Ah (48 watt-hour) of run time-even in sub-zero temperatures. Each 12 volt lithium-ion battery is laden with new-age REDLINK circuitry engineered to prevent overloads and protect against cell-damaging discharge. Revolutionary cell monitoring and temperature regulation prolong this battery's operation and life expectancy, meaning fewer work interruptions and more recharges than ever.