I don't know why you wouldn't be able to do so. They're specifying the battery, not that your battery can't be fully charged. So you're probably ok buying a few more. Although, if I were you, I'd buy the type from this year, not last year, just because FIRST will let you use them longer.
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There is a difference between interest and commitment. When you put money in a bank, you get interest. That's when a bank gives you more money than what you gave them. Commitment is what happens to crazy people before they're sent to an asylum against their will. When you are committed, it's often because you accept no one's explanation that you are not Napolean.
--Thanks to Katie(FIRSTAE2004) for the inspiration.
