I've had an Earthwise 24volt model for about 6 years. The part of my property I mow is about 1/2 acre. It will mow that and then need a charge, but once your done you plug it in and charge for the next time. Last year the battery started crapping out and not taking a good charge. I forget how much, but the factory battery was expensive. I found a youtube video where someone showed if you open up the removable batery case it contains 2 12v, and he posted links to where you could buy batteries with the same specs on amazon. Cost me $45 for new batteries and it was good as new again. The nice thing about a battery operated mower is that it is about as quiet as a window box fan. I'm sure the newer higher voltage models would have more torque and longer use time before needing a charge.
