bigdon1000 10+ year member
Junior Member
I had two batteries in my car for two year's and everything was great. Than one began to heat up crazy. I took it to get tested and it was bad, but the one in my trunk was good. If I had not checked on it that day it would have blown.I don't know why it went bad but different places tell me different things. Some say its my voltage regulator. Others say alternateor and also could be because batteries were not the same exact specs. Put in another battery and everything's normal........I know people here on this forum will probably have more experience then autozone workers with dual battery set ups so feel free to give some advice.