As I said, I have an update on this project. I got it wired up enough to test out and see that its working. I'll definitely need to get it all tidied up for use in the car. I also think I need to use some optical isolators to prevent any pack shorting between the two celllogs. For now, I'll probably just hook up one celllog to the arduino. I'm pretty sure I know which bank alarms out first. Anyway, instead of typing, I shot a video. If anything is unclear just ask.
edit: when I say maximum pack voltage I really just mean any alarm sent from the celllog.