missionkz wrote: I think u reverse biased the diodes and Zener so it shot the entire battery voltage to ground backwards and just blew the fuse open.
I would not be surprised to hear there is no damage other then the 20 fuse.
I exchanged the battery, and Battery Plus gave me a $10 credit for my troubles. You're right, the fuse prevented any damage from occuring.
I checked the voltage across the battery at various RPMs, and found it to be a steady 13-13.5V (analog multimeter) all the way to 8k RPM. I'm still not sure what killed my old battery.