I think most modern motorcycle batts tend to be small but powerfull gell cell type batts, not sure how they would cope with a couple of "deep discharges" if you have a good few flights & charges on the same day.
I say this because a couple of years ago I eneded up flattening a 40AH batt after a good day at the field & ended up having to jump-start, had to replace it a couple of months later as it was well "donald ducked"(was a couple of years old though to begin with though)