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12 volt AGM battery

Posted: Thu Nov 14, 2019 9:43 pm
by trevmar
Much has been said about the reliability of these batteries, but on a temporary basis ONLY what are the downsides to substituting a "conventional" SLI 12v battery? (if it fits mechanically)

I realize SLI batteries don't like deep cycling, but everyone has left their lights on at some stage, or parked an ICE car for a month............


Come to that, what about using a Harbor Freight AGM battery - much cheaper at $70, albeit only 35 A-hr.

Re: 12 volt AGM battery

Posted: Thu Nov 14, 2019 10:12 pm
by marspilgrim
I haven't tried it but I am positive that in a pinch a lead acid would be fine, like stranded in a ghost town and you want to get home. That said, long term I'd stick with a AGM with the same rating that came with the car, the way the engineers designed it. I know they're expensive though but fortunately we can't leave our lights on. :) Leaving the car sit for a long period it is worth investing $100 in a good battery tender but the real concern would be the primary battery.

Re: 12 volt AGM battery

Posted: Fri Nov 15, 2019 12:32 am
by SparkE
AGM batteries are supposed to be more resistant to sulphation.