So I've been chasing around an electrical gremlin. After cutting off all my solder joints and crimping them I still have the issue. Even just when cranking it seems the ground is weak. Is it possible the battery is bad? It is 8 years old. Holds 12.6 charge when not in use. I'm guessing this is probably my culprit. Now I'm not sure that this is entirely possible but it's all thats left.

So what are the best 12v batteries out there? I'd like it to have lots of CCA as well, because I plan to hit up the ice drags again and I need to start a 13.8 engine in -5 to 20 degrees. I'd also like to know what you guys do to maintain your drag car only batteries.

Thanks!