The Milwaukee M18 REDLITHIUM XC 5.0Ah Battery & Charger Starter Kit delivers up to 2.5X more run-time, 20% more power and 2X more life than standard lithium-ion batteries. The M18 REDLITHIUM XC 5.0 Extended Capacity Battery Pack features superior pack construction, electronics, and performance, delivering more work per charge and more work over the life of the pack. Its advanced design protects against harsh jobsite environments, routing water away from electronics, minimizing heat for extended run-time and life, and preventing pack failures from vibration or drops. This unique Milwaukee design also allows the battery to operate in extreme cold weather conditions (below 0°F/-18°C). Managed by Milwaukee's exclusive REDLINK Intelligence, the battery features overload protection to prevent damage to cordless power tools in heavy-duty situations, while discharge protection prevents cell damage. The kit provides full system compatibility with over 60 M18 cordless solutions, instantly increasing the run-time and durability of M18 cordless tools.