I have had an Ego 19 inch self-propelled mower with 5 Ah battery for four seasons now and it hasn't put a foot wrong, dead easy to use, quiet, essentially zero maintenance (I suppose one should sharpen the blades now and then, but, well...). I just stick it in the shed come September and pop it out again in May. For Morgan-owning mechanical maestros the absence of having to fiddle about with spark plugs, fuel, etc. may actually be a downside, but for me it's been a gods end.
My mother in law used an inexpensive plug-in Gardena model with a long lead for many years and was very happy with it.