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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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Old 03-25-2016, 01:25 AM
KenDiesel KenDiesel is offline
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Location: Marietta, GA
Join Date: Dec 2009
Posts: 43
Mein Auto: 325is, 328ic
Autozone 80AH battery for E36??? What is your battery's Amp/HR rating?

While comparing batteries and their reserve capacities and amp/hour ratings (Mine is 20AH) I went to the Autozone website and they claim that their Duralast battery for an E36 has an 80 amp/hr minutes reserve capacity (mashing two battery concepts into one) rating. I even e-mailed them to confirm if this was a misprint, pointing out that amps/hour and reserve capacity are separate measurements and that their ad for the battery was confusing. A rep contacted me to say that the site had a misprint, that the battery was a 80AH battery with a 75 minute reserve capacity!

Just curious if anyone else has something markedly greater than 10-30 AH? That seemed like hogwash to me; an amp/hr rating like that seems more like one for a 18 wheeler battery than a passenger car. If not then Duralast (which IS a good battery) should be a battery of choice, particularly for those of us experiencing slight but manageable parasitic drains.

AutoZone's response:

Thank you for your patience. According to our category managers the website is supposed to say Amp Hour rating of 80 and a Reserve Capacity rating of 75 min. We have already sent this to our catalog department to have it corrected in our website.

Last edited by KenDiesel; 03-25-2016 at 01:32 AM.
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Old 03-25-2016, 10:29 AM
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dc_wright dc_wright is offline
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Location: Orlando, Florida
Join Date: Nov 2007
Posts: 10,842
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Mein Auto: '06 Z4 3.0si, '11 128CiC
Battery capacity is a non-linear function related to current draw. The AZ battery may actually demonstrate 80 AH @ a drain of 200 mA. At a realistic usage drain in the multiple amps range it's capacity would be much lower. Somewhat misleading the way they're presenting it.
2006 Z4 3.0si Sport Package (But I'll still hang with my "homies" in the E36 forum)
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Old 03-25-2016, 12:51 PM
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johnf johnf is offline
John Firestone
Location: Bremerhaven, Germany
Join Date: Sep 2003
Posts: 2,826
Mein Auto: 1996 318is
The original battery for a 328i was 65 Ah. That is what my car came with. It presently has a 70 Ah.
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