[TonzOFun]

The backup battery is fine, it is the one we got in the kit last year, and I doubt it died that fast (it is still holding a steady power). Our drive has always taken way too much power, dropping our voltage from 12.9 (after sitting off the charger for 15-20 mins to burn off the surface charge) to 7.9 while trying to turn (doesn't seem to matter how far the joysticks are pushed), but it is only dropping to around 10 when going full power forward or back.

The re solder job was done correctly and we are about to re solder the +terminal just in case.

We also found a dead relay last night, a dead speed controller now and more things are likely to be found.

UPDATE:
It isn't the speed controllers and relays, it seems to be a progressive failure of the board. We drove the bot down to our auto shop to work on it and now PWM ports 3, 4 and 6 aren't working. We are going to try and reprogram the bot to compensate, but it seems its going to keep developing problems.

Time to fundraise for a new RC.