How big is your lawn?
I’ve got around 400 sq metres and I have used a Bosch 36v for more years than I can remember. I do have 2 batteries though.
The length of the grass will make a big difference, let it get too long and you can drain the batteries very quickly. However, keep it under control and 2 batteries will do my patch.
I have upgraded though to Ego 56v mower just last year. A variety of batteries are available from I think 2ah to 7ah. I went 5ah and again this is more than enough for my lawn. The reason that I upgraded was Ego also do a load of other garden stuff as well, strimmers, chain saw etc.
And just one more thing. The Ego is a bit heavier than the Bosch, but my wife can lift the Bosch, if you get my drift :wink: