Metabo Slide Li-ion Battery Packs are lightweight and durable. Work is possible even in extreme temperatures, a fully charged battery pack delivers 100% power from –15°C to +50°C. Ultra-M technology delivers intelligent battery management for long-lasting battery packs. Electronic Single Cell Protection (ESCP), protects each and every battery cell from discharging completely and from overcharging, for extremely long battery life. Patented AIR COOLED charging technology, the battery pack is cooled by a fan in the charger - for shorter charging time and longer service life. Compatible with all Metabo 18V machines and chargers that accept slide-on type batteries.