your right mine was 121.3 yours was 122.4 i remember now what would i do without you buddy

Running two batteries on one alternator not only strains the alt but also puts a strain on the batteries themselves as they actually attempt to charge each other. You'll need to get an isolator to make sure no current can go from one battery to the other and drain both. The cap poses a different type of drain in that in needs to recharge, and it can let a car sit for a few months and start without a jump.

By the way, would you guys like this thread split into two?

I guess if we have anymore interest in the Cap Vs. Battery debate it could use its own thread