The world’s first cordless grinder delivers the power of a corded grinder with up to 5X more run time and up to 10X longer motor life.The M18 FUEL™ 4-1/2" / 5" 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™ HIGH DEMAND™ 9.0 Battery Pack delivers up to 5X more run-time, 35% more power, and runs 60% cooler than standard 18V lithium-ion batteries.  It maintains full power and runs substantially cooler through heavy applications, allowing users to push their cordless tools harder and longer than ever before.  The M18™ REDLITHIUM™ HIGH DEMAND™ 9.0 battery is fully compatible with 100+ M18™ tools. The grinder features REDLINK PLUS™ Intelligence, the most advanced system of cordless powertool electronics, for maximum performance.The 18-volt 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 legendary high-performance corded grinders for maximum durability on the job. The kit includes 2 M18™ REDLITHIUM™ HIGH DEMAND™ 9.0 Battery Packs, a multi-voltage rapid charger and carrying case. Grinding wheel sold separately.