[pludodog]

We brought 7, had six chargers, only use five of the batteries though. It becomes rather annoying in the finals, when you have to either keep running back and forth between the pits and the robots, or try to steal an electrical outlet around the field for plugging in the charger. That's what I saw a few teams doing in NYC. Either way, we got a good 5-6 practice matches out of a battery before it was dead, but lately we've taken to powering up the robot and monitoring the voltage under some load for a few seconds, just to make sure that the battery is fully charged.

Team 375 had to have the best cart I've seen; they put a marine battery on their cart, put an inverter on there, and then carried around all their chargers and batteries with them.