I have a big yard so have a John Deere tractor to mow. Also a couple of gas lawn mowers. I know people with electric mowers and they like them so apparently they work fine. Probably for smaller yards.
I don't think a battery powered chain saw would do the heavy work so I wouldn't buy one of those. I'd go with a powerful gas motor chain saw. Depends on what you want to cut though.
My Ryobi leaf blower and string trimmer work great. I was concerned if the hedge trimmer would do the job. But the Ryobi hedge trimmer does a great job. They are quality tools. I've got several batteries so always have charged batteries to do the jobs.