vs
Battery OEM Mazda or Deka
You can get an Deka AUX18L from batterymart.com for $159 shipped to your door. Deka is the OE manufacturer of the BMW battery for the i3. My original battery lasted 7 years, it’s a no-brainer.
Pros: lasted 7 years
Vehicle:
BMW
Part number: AUX18L
2014 Mazda 3 with 322,000 kms, it's doing fine. I'm still on original engine, transmission and starter. I use it almost daily in traffic. The only problem is that the battery is slightly more costly than a standard one, which offsets the miniscule fuel savings you're getting from the system
Pros: original engine, transmission, starter
Cons: battery is slightly more costly
Vehicle:
Mazda 3
Mileage: 322000 km
I have this car. Most important is that below -12C, the gas engine stays on, and won't let you drive around on electric alone. That accounts for several months of driving in our winters. Secondly, even in temps below +10C, you have less access to the battery's energy, so your range drops even independently from the usual cold temp range losses.
Pros: preheat cabin from battery
Cons: gas engine stays on
Vehicle:
Mazda
Mileage: 20000 km
I use Deka sealed batteries so less offgassing messing up terminals.
Pros: less offgassing
Cons: messing up terminals
I only use deka on my service rig. Usa made quality. Though listed at 540 CCA, MY Midtronics tester shows they output 650 - 750 CCA.. I easily get 7 years use in the field with these.
Pros: USA made quality, high CCA output, long lifespan
My battery conked out at the normal time after 6 years. But it still didn’t give me any warning that it was dying. 2019 Mazda 3 here
Pros: lasted 6 years
Cons: no warning before dying
Vehicle:
Mazda 3
My brother and I both have/had 6 speed 2015 Mazda3 (me the hatchback, him the sedan), and both of us had terrible issues with the Mazda brand batteries.
Cons: terrible issues
Vehicle:
Mazda
These are excellent cars but for some reason the batteries they use are bad. I had a 21 Mazda 3. The battery failed in 2023. They replaced it under warranty. The new battery lasted literally less than 6 months.
Cons: poor quality, short lifespan
Vehicle:
Mazda 3
Mazda OEM batteries are trash. Always have been. 35 years with Mazda and we stocked a ton of them.
Cons: poor quality, unreliable
The only time I had issues with my battery was the original one when it was on its death bed. But I remember needing to clean the posts a few times and it would start right up. Never was left with a check engine light but when it acted up it would do weird things here and there.
Cons: issues when dying, acted up, did weird things
Vehicle:
Mazda
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Which battery to choose — OEM Mazda or Deka?
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:
- PR Score.
- Overall ranking.
- Vote balance.
- Average rating.
- Number of reviews.
- Feature ratings.
- Car owners’ choice.
Which battery are better — Deka or OEM Mazda?
In March 2026 on PartReview, battery Deka were overall better than OEM Mazda.
- OEM Mazda received a PR Score of 26 out of 100, and Deka scored 94 points.
- OEM Mazda ranked 28 in the overall ranking, and Deka ranked 3.
- The average rating is higher for Deka (4.4) than for OEM Mazda (1.9).
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Battery Deka have better feature ratings than OEM Mazda:
- Cranking - owners believe, that this property for Deka is better than OEM Mazda.
- Lights - drivers claim, that this property for Deka is outperforms OEM Mazda.
- Indicator - reviews suggest, that this property for Deka is preferred to OEM Mazda.
Which battery are more popular — OEM Mazda or Deka?
In March 2026 on PartReview, battery Deka were overall more popular than OEM Mazda.
By vote balance, battery Deka surpassed OEM Mazda:
- For OEM Mazda, the ratio of positive (31) to negative (85) votes is -54 votes.
- For Deka, the ratio of positive (143) to negative (8) votes is 135 votes.
By number of reviews, battery Deka surpassed OEM Mazda:
- For battery OEM Mazda there are 38 reviews: 9 positive, 2 neutral, 27 negative.
- For battery Deka there are 50 reviews: 47 positive, 1 neutral, 2 negative.
Which battery do car owners prefer — OEM Mazda or Deka?
In March 2026, according to PartReview, battery OEM Mazda and Deka have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.
Other comparisons of battery
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of battery OEM Mazda with: OPTIMA, Varta, Bosch, OEM Subaru, OEM Volkswagen, YUASA, Tesla, Duralast, Exide, OEM BMW.
Also available: comparisons of battery Deka with: OPTIMA, Varta, Bosch, OEM Subaru, OEM Volkswagen, YUASA, Tesla, Duralast, Exide, OEM BMW.
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.