Looking for more power and longer runtime out of your HART 20V tools? Then this 20V 4.0Ah Battery 2-Pack is for you. Battery provides 4X the runtime* and features an on-board fuel gauge so you always know how much charge you ve got left. Plus it s compatible with all HART 20V power tools. 20V 3 AMP Fast Charger will charge any HART 20V battery at 3x the rate of the standard 0.5 AMP charger. 20V Brushless Impact Driver provides up to 2 200 in.lbs of torque while the variable speed trigger delivers up to 3 000 RPM for strength and controlled drilling and driving. Brushless Motor Technology delivers up to 30% more power* and is up to 20% faster*. This tool™is fade-free strength will get you through your project with confidence!