Re: Diehard batteries any good?? (USARMYTTT)
Don't take a chance, any regular lead-acid battery can leak. I had a DELCO leak in a new Pontiac Bonneville. In your C5 if it leaks, the computer and the wiring harness can be toast ! They are located directly under the battery.
I replaced my DELCO with a Champion XLT (AGM Battery) size/number DT35/CHXDT35 made by Exide. Got it at SAMS Club for $90-95. It has 690 CCA, 850 CA, a 36 month free replacement and free jump-start, and a 108 month limited warranty.