We get about a match and a half out of our battery then it dies..
We won the regionals after 7 elimination matches and we did fine with 4 batteries as long as you have a battery runner to keep going to the pit with a dead battery and takeing a new one...

Also I believe FIRST had battery charges in the area..
At UTC i saw like 3 or 4 chargers where the blue alliance worked on their robots, they might have been our alliance partner's though, but it said "FIRST" on a piece of masking tape, but i dont remeber seeing our alliance partner bringing chargers to the red side when we were on the red alliance..
I should have asked