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For whatever its worth, my AC Delco went bad when it was constantly being started but not run long enough to charge the battery while it was at the body shop. Because I got a credit for the remaining months on the battery I decided to go with an AC Delco again rather than lose the credit towards another battery and its hasn't given me any grief in 6 months.
I honestly never had a problem with my original AC Delco bat, except that the little green eye never worked from the day after I brought the car home from the dealer, seven years ago. My main concern was, is there a reason for going away from the original style of battery? And what style is the right one? I was told there was a corrosion problem and that my car was supposed to have a different kind of battery that would never leak or something like that.
I did a search on these forums and didn't find anything, but that was before I joined, yesterday, so I will try again.
Close to the top of the page is a search feature for this forum. Use the search word optima and you should get a lost list of post/threads dealing with battery selection.
You should consider that those original Delco batteries that were subject to cracking around the terminal and leaking are NO LONGER PRODUCED! They have been replaced with new and improved.
You should consider that those original Delco batteries that were subject to cracking around the terminal and leaking are NO LONGER PRODUCED! They have been replaced with new and improved.
..but actually, they were replaced twice. The first replacement occured in 2001 with the AC Delco AGM. This battery was designed to last well past 5 years and I can attest to that, as my OEM battery is now more than 6 years old and still going strong. However, AGM batteries don't like to be drained because of insufficient driving (charging) time and many a C5 owner killed theirs due to this condition. AGMs aren't for everyone, so AC Delco redesigned their lead acid battery by strengthening its case, especially around the terminals. The current AC Delco battery is very robust and should last a long time. The professional versions that are recommended for the C5 have a 50-month free-replacement warranty.
Sears and Exide have AGM batteries, but only time will tell if they can withstand partial charges better than than the longtime AGM, the Optima Redtop. Many forum members have had Redtop premature failures, although I'll bet most of the ones who have good luck with them either use a battery tender or drive enough to keep them well-charged.