Flexible Power System - Match the battery to the application by using the SlimPacks for 36-volt power and less weight than most 14.4-volt batteries or the FatPack for 36-volt power and maximum runtimeLitheon™ 36V Batteries - The most advanced Li-ion battery available today allows more battery charges, and longer run timesBrute Tough™ Construction with Unibody Powertrain, Metal-Reinforced Collar and Durashield™ Housing - Constructed to withstand real world conditions; withstands repeated 1-story drops when the competition failsHammer On/Off Ring - Easily engage and disengage hammer modeHigh-Torque Mode - Produces over 600 in.-lbs.Externally Accessible Brushes - For brush replacement in as little as 2 minutesRatcheting, Carbide Tooth Single-Sleeve 1/2"" Chuck - For one-handed bit changes15-Position Clutch - For maximum versatilityBosch-Designed Powertrain with Metal Gears - For increased life and durabilityLitheon™ Fast Charger - Charges 36V batteries to 80% of capacity in 30 minutes