How many extra batteries should you bring, and where can you buy more?

[Jeff K.]

It depends, does your robot drain your battery quickly so that after each match, you have practically a dead battery? Because if so, then you should bring extra batteries. If it doesn't, like if you could go through a few matches on a single battery and still be running as if you just put in a new battery, which would be really awesome if they would last that long, but if your robot could do that, then maybe just 3 or 4 batteries besides the one in your robot, so 4 or 5 total might be a good number. But actually I have a question. The batteries this year, are they different than the ones last year, and if they are, can we actually use last year's batteries, or do we have to order more new ones?