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I ended up going to batteries plus, getting a Duracell battery that they installed and warranty for 3 years ago for about $300.
I put in an 850 cca 800 amp battery and the old one (Duracell or something I think) I replaced was a 900cca battery. Old one was h8. I replaced with an h7 because thats what fcp euro said was the right size for my car. That was the issue. Took it out and replaced with and H8 and it was still in limp mode! Got my code reader out and cleared the codes and restarted and everything works great now
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 still prefer Duracell.
I've had good results from East Penn Duracell at Sam's Club. I just replaced one nearly 8 years old.
The best way to check is to go with a multimeter and get the highest voltage/closest manufactured date. Duracell might just be EverStart rebranded BUT NO the Walmart battery will last around 1-2 years, maybe less. If you want to make sure your covered with a good battery, that’s when you go to Advance Auto or AutoZone and get the battery with 3 years of warranty and swap it out right before the 3rd year ends and I find the batteries last me forever.
The best lead acid type of battery is a Duracell/East Penn hybrid/house AGM deep cell. These have thicker plates and are typically used for RVs and boats. They can tolerate deeper discharge and are less susceptible to damage (AGM). They sacrifice a little instantaneous current output, but that's not needed on an EV.
How's the Duracell Vs the oem? I have 6 battery to buy (2 per pack) for a similar ups (1300va from apc with same lcd).
Duracell [battery] with a 3 year free replacement warranty. Last one failed unusually early, just short of 3 years
FWIW…. I’ve had 3 Duracell batteries and all have died within 3 years of manufacture date, and they have a 2yr warranty.
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In March 2026 on PartReview, battery Deka were overall better than Duracell.
In March 2026 on PartReview, battery Deka were overall more popular than Duracell.
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