I had a husquavarna (sp?) petrol mower – was great. Got noisy(er). I eventually killed it (~18 yrs old).
Replaced with greenworks 40v lion. Battery lasts long enough. Problem seems to come from when you cut it short, the motor seems to work harder and eventually refuses to start.
Other issue is that it does not seem to throw the cuttings into the basket with the same force, so is easily blocked up before it is filled up.
Lovely and quiet though! If you are just trimming (ie cutting reguarly) then it is much better than a noisy petrol mower.
For sheer brute force it is not a patch on petrol!