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The funny thing is that your 2003 came with an AGM battery from the factory! Many folks mistakenly swapped out their AC Delco AGM battery for an Optima during 2001-2003. Luckily, I noticed the AGM designation on my battery. It lasted more than 7 years.
Sometime before 2004 AC Delco switched to Johnson Controls to make their non-AGM batteries. Since then, I have seen more leaky Optima posts in this forum than I have leaky AC Delcos (2004 and newer). And the few other battery manufacturers who make non-AGM batteries have stregnthened their battery cases so that leaky terminals, while rare before, are now almost non-existant.
Guys, the leaky battery scare is long gone. Don't let an old ghost make you spend far more for a battery than you have to.
$63 for a Johnson Controls battery (Kirkland) is all you need to go 5+ years. Now if you are off-roading in a rail or dune buggy, an AGM battery is a no-brainer. Also, if you like run-flats, an AGM may make you feel good as well.
Dee Gee, I never thought I'd see the day!
Well I don't have a hotline to a Battery Durability Call Center so I only know what I see & read. And back then AC Delco's were leaking and of all the things I don't want to have happen and the trouble you go through to repair the situation. But again, we all have our favorite battery story, oil and tires beliefs and I'm not trying to change anyone. You go buy whatever makes your boat float and I'll do the same.
Thats why I went to the optima. The first-red top didn't last long - but they replaced it under warranty. The second one is on its 3rd year and going strong.