[Andy A.]

4 batteries and 3 chargers are an ideal set up. More batterys then that and your just cluttering up your pit, if you ask me. As long as a pit crew member is paying attention to keeping the chargers running, you shouldn't have any trouble staying powered.

Getting into elmination rounds, you may need a fresh battery if you end up going all the way. This is rarely a problem, since elminated teams are usally happy to lend a charged battery. Just ask.

-Andy A.