Can anyone tell me how much time is there between rounds typically? Do you get time to top up charge or should I plan for a massive 6S battery or a couple of smaller ones?
Depends on the event. Extreme Robots tends to be about an hour or so between FW melees. If Robots Live continues its 1 per show thing, it will be roughly the same. I can have 2x 2S LiFe batteries charged comfortably in that time but I tend to take 2 sets of batteries (4 in total) so I can swap one set out for the other and have the original on charge.