Hmm... The duration and subsequent charge time of batteries depends on how hard they are pushed, as you note.

The batteries I have in The Honey Badger 2.x are 2x 2S1P 2100mAh LiFePO4 batteries wired in series. Running around at full pelt, they can go about 2 fights before they are in need of charging (accidentally found this out at Maidstone 2017). This is why I carry around a spare set of batteries though - in between fights I can swap out one for the other and put them on charge whilst the other set goes out.