My battery on high setting only lasts about 20 mins. On low it's 30 mins. I couldn't get my whole roof and patio cover in 1 charge. I had to take a 30 min break and eat lunch and go back up. I live in the NW and you need power for more than 20 mins to blow off wet leaves from a driveway, 15 x 30 patio and 60 ft of sidewalk. If it's bone dry same job takes 10 mins. Again, battery doesn't last long on average job. I think I'll have to buy another battery.??