Btw those DeWalt strimmers can develop a common fault eventually. I took one apart for a friend after it started cutting out. I took the bottom apart and cleaned it all – no fault down there.

It's up in the handle. There's a connection between two blue cables. It lays next to what looks like a transformer. So it gets hot and melts the plastic coating for the connection. I'm still trying to figure out what to replace it with. Probably solder and heat shrink. Maybe a metal crimp? Another plastic connector block well probably just melt again. I just need to borrow or pick up a soldering iron from somewhere.

Anyway, thought you might like the info on case yours starts cutting out. This one was cutting out here and there for a couple of weeks before it stopped completely.

As for the mower, I'm no pro but when I rent somewhere with a lawn I use a hand push mower. It's quicker, easier, and results in better grass than an electric imo. Even with bigger lawns tbh. They're also practically silent and while you might run out of energy, it won't. I find they've got their own momentum, though, so it's not really any more difficult than walking up and down with a non-self-propelled gas mower. Something to consider.