Compatible with all Milwaukee M18 cordless tools, the M18 REDLITHIUM XC extended-capacity battery delivers 4 Ah (72 watt-hour) of run timeeven in sub-zero temperatures. Each 18 volt lithium-ion battery is laden with new-age REDLINK circuitry engineered to prevent overloads and protect against cell-damaging discharge.Professionals depend on heavy-duty, long-lasting performance and Milwaukee delivers with this 18 volt battery pack.This versatile charger accepts all M12 and M18 batteries, so youll always be prepared, especially on jobs that require a mix of M12 and M18 Milwaukee cordless power tools. Fast and efficient, power your Milwaukee compact batteries in just 30 minutes and extended capacity batteries in 60 minutes, without the hassle and of taking extra chargers to your jobsite.