The world's first cordless grinder delivers the power of a corded grinder with up to 2X more run time and up to 10X longer motor life. The M18 FUEL™ 4-1/2 in / 5 in grinder supplies maximum sustained power to complete the toughest grinding, surface preparation and cutting applications. The POWERSTATE™ brushless motor provides up to 10X longer motor life and lower cost of ownership. The M18™ REDLITHIUM™ XC5.0 battery pack (not included) delivers up to 4X more run time and 20% more power. The grinder features REDLINK PLUS™ Intelligence, the most advanced system of cordless power tool electronics, for maximum performance. The 18 V lithium-ion grinder's thin body design gives it optimized balance to rest easily in your hands. Tool-free accessory changes and guard adjustments mean less downtime during work. The grinder is built with the same tool body, gearing system and anti-vibration side handle as Milwaukee's high performance corded grinders for maximum durability on the job. Delivers maximum power and up to 10X longer motor life Battery pack (not included) provides superior pack construction, electronics and performance to deliver 2X more run-time and more work over pack life Same metal housing and gearing system as legendary high performance corded grinders Reduces user fatigue Intelligence provides optimized performance, electronic clutch and overload protection using total system communication between tool, battery and charger