[techhelpbb]

Best way to be absolutely sure about the legality of something with FIRST FRC is to ask in the official FIRST forum. I would ask early as this is a pretty straight forward question.

Generally, from what I have seen, people manage to get batteries that are not FRC legal into carts and pits as long as someone does not catch it. That is not exactly the most reliable tactic in the end and I prefer not to encourage people to find ways to stash things that really could be dangerous if done improperly or with people unaware.