I've put my trust in Varta. Previously had Bosch. I think you can put your trust in pretty much any brand if its covered by a 2-year warranty.
Pros: trust in Varta
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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.
Pros: never been replaced
I always hear people talk about issues with newer Optimas but my old REDTOP is going on 13 years old and still going strong.
Pros: 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.
Pros: works great, no issues
We needed to replace the original German Varta battery in our '14 A4 (date code Jun '13) after the first polar vortex in early '19. OE list was $227 (non AGM), discounted to about $195 at the local Audi parts counter. Advance Auto had an equivalent H9 for about $170, but the local store only had one with a late '16 date code (and proper BEM sticker). So they sold it to me as a \"used battery\" (after running their condition test and passing) to me for $45 + tax. Two years later, so far, so good.
Pros: so far, so good
Vehicle:
Audi A4
Deka is the best I’ve found.
Pros: best performance
I have a pair of Optimas (older) and they're dead-ass solid.
Pros: dead-ass solid, reliable
I installed a new battery but now the car won't start or turn over.
Pros: new battery installed
Cons: car won't start
Vehicle:
Volkswagen
I have definitely experienced said quality issues on multiple Optima batteries. They all lasted about a year for me.
Cons: short lifespan, quality issues
Haven't been impressed with the quality of optima over the last 5ish years.
Cons: quality not impressive
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