Between-Match Battery Swaps

[zachriggle]

I cant find anything against it in the rules, but I just want to check for legality:

1.) We CAN change batteries between matches, correct?
2.) We CAN have a total of more than two batteries to swap in/out, as long as only one is ever on the robot, correct?

In the event that both of the above are true, where might we be able to purchase more batteries? If most can get 2 matches out of a single battery with moderate power usage, you should be able to at least one match if you don't worry about battery consumption, correct?