It was great fun hooking up a rookie team with another team (1126) who was building a second robot for practice, then letting the rookies use our batteries to run in the competition... Keeping eight batteries charged sufficiently for two teams was an exercise in management that made my pit crew half-mad!
And on the other hand, I got to re-meet and be interviewed by Libby Kamen, and then later get video of her taking a cream pie to the face, so despite the financial loss of long-term battery life, it was all more than worthwhile in the end. (I bear Libby no ill will, of course... It's just that the look on her face immediately before being pie-smote was *priceless*!)
Edit: We got some nice press, too!
http://www.democratandchronicle.com/...WS01/110300337