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 Reciprocating Saw cuts through wood metal and PVC pipe without having to think twice. Due to Brushless Motor Technology this saw boasts a 70% faster cutting speed with a 1-1/4 stroke length and on average you ll get 65% more cuts per charge.