[pwnageNick]

That looks nice. I was thinking of overcomplicating things, and building a BMS (Battery Management System), to automatically pick the best battery, and to automatically do battery diagnostics!

So basically what a Battery Beak does:

http://www.crosstheroadelectronics.com/Beak.html

We have one on a lanyard attached to the cart at all times. Works really well and is super simple to use. It is also made and sold by Cross the Road Electronics, which was started by Mike Copioli, who is very involved with FIRST. They also make the Talon motor controllers that many teams in FRC use.

-Nick