Spare Classmate Battery Sources, Charging Externally

[kmcclary]

We're seeking a spare Classmate Battery (and an external charger for it). Since you must run on it when competing, having at least one charged spare on hand for the Classmate [2010 Driver's Station] seems like "a good idea".

Questions:
1) What is the right PART NUMBER for the battery? (There seems to be a number of "Classmate" batteries.)

2) What's the best price (and source or URL) anyone has found to date, for a spare Classmate Battery?

3) Has anyone found a way to charge it up OUTSIDE of swapping it into the Classmate? (Like hacking a smart universal charger to connect to it.) It would be nice to have an external charger for the battery for the pit. When searching cticorp for "charger" I had no hits. (... and buying another Classmate JUST to charge batteries is IMHO plain silly... )

adTHANKSvance!

- Keith