3 is the magic number in my experience. They’re comfortably done charging at that point. I have a lot of M18 fuel tools so I happen to have a bunch of those bat

3 is the magic number in my experience. They’re comfortably done charging at that point. I have a lot of M18 fuel tools so I happen to have a bunch of those batteries around. The experience is so much better than gas though. No terrible fumes, no continuously filling up two different tanks every 30 minutes, relatively quiet, no flooded engines, no having to pull start 20 times in cold weather, no dealing with fuel filters and worry about leaving gas in the tank.