I like my 20v Kobalt 14" chainsaw & tree limber. Two batteries last as long as I do. Had an oak fall in the front yard, I cut most of it myself but there was one spot where a mistake could have killed me. Called in the pros. He got his chainsaw pinched, borrowed my cordless to get it out. I do use a couple gas powered for the larger stuff.
Just before reading this thread I gave the generator it's monthly running. I hook up a heat lamp for a load.
But there's no way in hell I could do all the yard work with cordless or even corded tools. Five acres is a bit too far to run an extension cord, and I doubt anything would work well enough off a portable solar panel setup.
ETA: I run the gas out of the carb when shutting down. Turn off the fuel valve, run it until it starts to sputter, then use the choke until it dies. Figure it helps keep the carb clean.