Built-in battery and charger? Sounds like a bit of a pain. Prefer removable battery as you can charge 1 while using one, you can replace it if it loses capacity, and you don't need power in the garden shed.
How about this one?
21" good for larger lawns, possibly a pain for smaller lawns, but comes with two batteries.
This has to the the best of all though:
I agree , the built-in battery and charger is a pain if something had to go wrong
the Victa does seems smarter having 2 x 2ah batteries (instead of 1 x 4ah of the masport)
It says steel chassis vs. Masport alloy chassis
The grass area isn't great between (around 150m2)
But I do tend to let the grass grow long as it's on the council parts on two sides of a corner section
So in the hope one charge of the 4ah battery would be sufficient