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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.
I called roadside and got it installed for 100 dollars 3 months ago.
Best upgrade I did for my fit was upgrading to a 51r battery. Just the other day I left my interior lights on all night and I didn't notice until I went to work in the morning, but it started up no problem.
Cells in the battery are probably done. Happened to my wife\u2019s accord. Said the battery was fine and wouldn\u2019t charge because she barely drives it since she works from home and recommended we get a battery tender. Come to find out the charge of the battery was fine but the cells were dead which is why it wouldn\u2019t charge. Time for a new battery.
I\u2019ve jumpstarted my 2019 freightliner from a Honda Accord before.
I use Deka sealed batteries so less offgassing 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.
I have gone through two batteries already. They seem to only last 3-4 years on this car - at least in my experience.
That happened to me when the battery was dying. The Honda OEM batteries suck.
I did have to buy a new battery because the OEM was leaking, but other than that, the vehicle has been great.
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In March 2026 on PartReview, battery Deka were overall better than OEM Honda.
In March 2026 on PartReview, battery Deka were overall more popular than OEM Honda.
By vote balance, battery Deka surpassed OEM Honda:
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For example, comparisons of battery Deka with: OPTIMA, Varta, Bosch, OEM Subaru, OEM Volkswagen, YUASA, Tesla, Duralast, Exide, OEM BMW.
Also available: comparisons of battery OEM Honda 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.