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I've had really bad luck with AGM batteries.
I own a performance company, and have a lot of customers who want smaller, AGM units due to either weight reasons or physical six constraints. There are always a few people that have had years of use out AGM batteries without issue, however most people will see a few instances of deep discharge because it wasn't unhooked while storing the car, or ran dead by some system being left on (lights/stereo/whatever).
After that point, we can often get them to take a change if you let them slow charge overnight, but even with the battery sitting on a bench they will typically float back down to sub-par levels, or their reserve capacity is severely diminished.
The only good thing I've experienced is that most battery wholesalers don't even question a warranty claim on them and just trade them out no questions asked.
Great battery if you keep them charged constantly, but quickly develop issues when not kept in this manner.
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06-06-2015, 09:02 PM
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