Milwaukee® M18™ REDLITHIUM™ Cordless Battery Pack, Rechargeable, Li-Ion Battery, 5 Ah Battery, 18 V DC Charge, 1/2 hr Charging, For Use With: M18™ Cordless Power Tool

Delivers up to 2.5X more run-time than standard lithium. Provides more delivered energy than any 18 V pack on the market. Delivers up to 20% more power than standard lithium. Faster application speed & increased application range. Provides more work over the life of the pack than any 18 V pack on the market. REDLITHIUM™ Protection prevents pack failure from vibration or drops, routes water away from critical components and out of the pack, minimizes heat to extend run-time & life, operates below -18C/0F. Forward and backward compatible with 60+ M18™ tools.