Trebuchet
Penultimate Amazing
I've replaced my mower with one powered by biofuel.
It has the bonus of keeping those pesky neighborhood kids off my lawn.
I got a Ryobi one a couple of years ago. It will reliably cut 95-98% of the lawn on one battery charge. But it came with two and it takes only a minute to swap. I usually need a breather by then anyhow.
I'm trying to talk myself into one. Unfortunately there's nothing wrong with my existing electric mower... other than the fact that I don't enjoy lugging the cable around to plug it in.
I've had it for at least 15 years. My cheapskateness tells me that I don't want to pay for a new one if the mower batteries don't last 15 years.
For things like mowers and my power tools (which get infrequent use), I wish I had a smart battery conditioner. I fear that if I just leave the battery on charge after every mowing that it won't last long.
How much mowing (in minutes) do you do? I have two unimpressive lawns, so I can finish in about 20 minutes of runtime per week (and another 10 minutes of unbundling, moving, and rebundling the power cord).
I don't think the battery life is that big a concern in the age of Li-Ion and smart batteries and chargers. It takes me probably 40 minutes or so to do my patch of green, a bit more if I do the parts outside the main yard. Those don't need it so often.