Shop Wise Line Tools for Dewalt Lawnmower. Master overgrowth with the robust performance of our Dewalt 20V MAX* and Cewalt FLEXVOLT® 60V MAX* lawnmowers. Dewalt's 60V MAX* lawnmowers cut through the toughest jobs with the horsepower of FLEXVOLT. And by using FLEXVOLT batteries in your lawnmower, you can get up to 8x the battery runtime to get the job done without switching out batteries.