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 7-1/4 Circular Saw your go-to for all your cutting applications. Brushless Motor Technology delivers up to 38% faster cutting with 4 000 RPM s and 34% more cuts per charge. It also includes an LED work light and vacuum dust attachment to keep your cut line bright and clear of sawdust.