I know its early days, but the victa auto power engine mower is cleaning up in reviews, 4.6/5 so far on product review.
It uses a 1200w motor, which doesnt sound a lot given some high end scooters use this size engine. But its powerful and only uses what is needed.
Its power bank is 1500w - charges in 30 minutes.
It also has a leave blower, line trimmer etc attachable using same power bank. Im yet to look into how good they are.
I have a gorgeous back lawn as long as you cut it bi weekly summer, monthly winter. This is plenty big enough for it.
So Im actually considering it. $550 is not a lot in mower terms, but feels a lot as is power driven. Will keep you informed.