It looks hard to get the battery in and out, as the door on the battery compartment won't hold open, and I don't see a handle on the battery. I am 68 with small hands, that are not all that strong. This could be a dream mower if the battery is easy to handle.
Theresa, which mower and batteries are you looking at? We can answer your question better once we have the specifics. In the meantime, here’s a video that night help address your concerns: https://youtu.be/FkLeSbSVnqY