I remember this very interesting post a couple years back regarding AGM batteries and their charging requirements: On the one vehicle that I modified the charging circuit to run at 14.7V I have an Optima Redtop battery in it that has never been replaced. And this includes repeated discharges to near 0% SOC when the sales people at the tradeshows forget to turn the vehicle off after the show.
I always hear people talk about issues with newer Optimas but my old REDTOP is going on 13 years old and still going strong.
i have a optima red top in my drift car. its been in the car for atleast 4 years. 3 of which i have owned it. its been crushed, deformed, on fire and drained dead multiple times (always when diagnosing electrical issues or wiring up lights) and it still works great. it sits in my car hooked up and unused for weeks at a time with no issues.
Deka is the best I’ve found.
I have a pair of Optimas (older) and they're dead-ass solid.
They’re pricey but I’ve always sworn by Optimas
General consensus is that the yellow top optima battery is best. Also, the optima is the only aftermarket battery that has the vent hole in the same place as the OEM battery.
I always liked Optimas, but I bought mine 2-4 years ago. I heard the quality has gone down but haven’t checked myself.
Purchased one a few years ago, bad a year later and yes I have a good battery tender.
The "new" Optima in my RX7 died after a very short life
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