1998 6.5 Suburban LT 2500
Discussion Starter · #1 ·
I replaced my batteries on the Burb August 2019 with two new Odyssey extreme duties for nearly $700 delivered. So they are about 3 1/2 years old and after just now testing them they’re both down to half of their rated cold cranking amps and in the REPLACE status. Many folks report 9+ years out of these batteries. I was reading online that AGM batteries like to be charged at 13.8 V or higher even up to like 14 and 14.02 V. I don’t know what voltage GM set up the six-fives to charge at? My voltmeter in the dash looks like it’s putting out 14 V when there’s not a lot of loads on it. I don’t know if these batteries didn’t last as long as they do for a lot of people because these trucks electrical systems don’t charge at a high enough voltage to keep them topped up. I read that if you’re charging below 13.8 V on an AGM battery that can greatly shorten their life. I’m not going back with Odysseys after this expensive experiment obviously. If anyone would give me a recommendation I would appreciate it, I’m heading just toward the Interstates sold at Costco for the price they seem to be lasting folks around four years if taken care of. Thoughts appreciated.