I have 7 acres, most has to be mowed. I use a JD 425 w/60" deck and a Ryobi 40V for the trimming. I didn't think I'd like it, but I'm here to tell you it's a beast. Not the best battery mower out there, but real darn good. If I hand mowed more than I do, I'd have an EGO, they are more powerful than a lot of gas engine mowers and are built like a tank. The Ryobi is not as tough built, not that it's a wimp, but just not quite up to the same abuse. I've mowed grass 6"+ with the Ryobi and it mows fine. I don't currently have the discharge chute for it, so I have to mulch, but it's gets the job done.
I would say to all the nay sayers, these are not your grandad's electric mowers these days. they've come a long way. I bought mine primarily because I wanted a lightweight mower for banks, and flymows are not around anymore. It wasn't until I got it home and used it, that I realized how well it really mows. I was swayed from buying an EGO because when I got there, they had a returned Ryobi on clearance and I thought , hey I'll give it a try. and the manager said I could return it no sweat if it didn't work out, well, I've still got it and used it all season last year!