Even though the battery tested fine the problem went when I replaced the battery.
Love the optima redtops, seem to last forever
Finally pulled the trusty old Panasonic battery out of my CX-5 and replaced it with an Optima Yellowtop. When I buttoned everything up, I still had my radio stations and settings right where I left them.
Buy a nice battery. I bought used 6 months ago and did a week of nightly research first, by FAR the biggest complaint was the battery going out or having constant low messages. I put a yellow top in mine a few days after getting it, not one issue this far.
Also, most car manufacturers know that customers are generally bad at doing the "correct" thing, so they protect their batteries by design.
When you are charging to 100% you are actually closer to 95-97%, when you run your car to 0% it's actually 5-7%
All because it's easier to show you another number and build the protection into the system, than to change people's habits.
Get the battery from the dealer. It lasts longer and has a 7 year warranty. The Optima Yellowtop died on me after 3 years.
Of course you do. 16-19 kWh/100km to 20-23 kWh/100km. Kia EV6.
I bought a ‘24 GT with 5k miles and regret it every day. The battery had to be replaced at 9k miles and we had a loaner for a 5 weeks. Everyday issues like Carplay not working 50% of the time and the backup sensors being way too sensitive drive me insane.
Fwiw optima batteries have been garbage for the last 20 years.
Optima batteries are absolute trash for deep discharge use. Their quality is also not what it used to be. Anytime I see them in marine use, I swap them out for a proper AGM. Only thing they are decent at is starting applications in cars.
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If choosing battery across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare battery across these categories:
In March 2026 on PartReview, battery OPTIMA were overall better than OEM KIA.
In March 2026 on PartReview, battery OPTIMA were overall more popular than OEM KIA.
By vote balance, battery OPTIMA surpassed OEM KIA:
By number of reviews, battery OPTIMA surpassed OEM KIA:
In March 2026, according to PartReview, battery OPTIMA led more car-specific ratings than OEM KIA:
OPTIMA are chosen by owners of cars such as: Audi TT, Honda Civic, Jeep Cherokee, Nissan Leaf, Subaru Outback, Subaru Forester, Volkswagen Jetta, and others.
Battery OEM KIA have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of battery OPTIMA with: Varta, Bosch, OEM Subaru, OEM Volkswagen, YUASA, Tesla, Duralast, Exide, OEM BMW, Deka.
Also available: comparisons of battery OEM KIA with: Varta, Bosch, OEM Subaru, OEM Volkswagen, YUASA, Tesla, Duralast, Exide, OEM BMW, Deka.
You can also see who is better among other battery manufacturers: OPTIMA or Varta, OPTIMA or Bosch, OPTIMA or OEM Subaru, OPTIMA or OEM Volkswagen, OPTIMA or YUASA.
