Assuming that JC makes the same battery for Walmart as Autozone (both are rated at 760 CCA and both made by JC) and the AutoZone battery RC is rated at 100 min, then using the RC to AH converter formula of Amp/Hours = (Reserve Capacity / 2) plus 16, you get 66 AH. I'd use the closest setting (70 AH?) in your coding.
Autozone H8 battery specs:
http://www.autozone.com/autozone/par...er=832331_0_0_
GL