I had an enviromower for about 5 years. They got taken over by Victa a couple of years ago. It wasn't bad, nice and quiet, but after a while it struggled to get through both the front and back lawns. I usually mowed one, the recharged the battery overnight, then mowed the other. I replaced the battery once, which cost about $100, and then the chassis cracked and that was that. I bought a 4 stroke, and it'll probably still be going after I'm long gone. There was a bosch cordless one I saw - looked nifty and at least used a Li-ion battery, for faster recharging.