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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 09-11-2013, 12:52 PM
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BB_cuda BB_cuda is offline
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Battery data

I've read many threads about coding and regestiring batteries. I'm still using the original one but have been hunting for candidates. Short of buying from the dealer, it is difficult to dig up data for aftermarket units in regards to Ahr rating. Well, I came across a couple pieces of information for Johnson Controls and East Penn. The Johnson Controls clearly says Ahr but East Penn says "20 A.H rate". These values look quite similar to the Ahr rates from Johnson but I'm not 100% sure. I hope this helps others. The East Penn (Deka is the product line name) has the numerous caps that are circular. NAPA and some others sell the Deka. Advance Auto has the J.C. units. Provided you can determine that one of these 2 is the manufacturer being sold buy Autozone, Walmart, Advance Auto, NAPA, Sears, etc. here is some data to guide your decision.

My OEM battery's label (P/N 61217604820) says 90 Ahr and is the 94R/H7 size but as of yet I haven't found that size to be 90 Ahr. I'm finding they are at 80 Ahr. I would like to do the BT cable route if i can find a match. I seem to only be able to match the 90 Ahr if i use the 49/H8 AGM. But AGM is a different ball game needing a recode (above and beyond the BT method's capability) BT method only good for matching specs.

THIS IS NOT A THREAD TO DEBATE WHETHER YOU SHOULD JUST SLAP A NEW ONE IN WITHOUT REGISTERING. For you folks that have, great but I'm trying to do this the intended way. I may have to break down and just pay an Indy and go for the AGM in the 49/H8 size. It appears to be the quality unit.

I bought a battery tender about 2 weeks ago and the "increased battery discharge" messages have stopped. I'm a little wary that trouble may be on the horizon so I've been internet shopping.
Attached Files
File Type: pdf johnson_controls_AGM_batt_specs.pdf (870.4 KB, 28 views)
File Type: pdf deka_battery_specs.pdf (745.3 KB, 18 views)

Last edited by BB_cuda; 09-11-2013 at 12:59 PM.
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  #2  
Old 09-11-2013, 01:34 PM
fdriller9 fdriller9 is offline
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Why do you want an AGM? I retrofitted an AGM because I frequently drive short distances and AGMs have better deep cycle performance.

I originally had a non-AGM, 90Ah battery. Coded my car for AGM, 56 AH (lowest profile available), and retrofitted a braille 21lb battery with 31Ah and 550CCA specs.

The braille was too low spec'd to handle cold weather. My car would struggle to turn over, but it always turned over in the winter. During the summer it was fine, no hesitation.

I ran the braille for about a year before deciding to replace it with a 100Ah oem exide AGM. Coded the car for 90Ah, AGM, and it's been fine since. I think the next profile is 110Ah and I didn't want to over charge my battery. I'd rather have it slightly discharged and top it off with a tender.
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Old 09-11-2013, 01:39 PM
jburke4689 jburke4689 is offline
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My OEM battery is made by Exide. I got it from the dealer but I am sure you can get it from any Exide dealer.
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Old 09-11-2013, 01:41 PM
fdriller9 fdriller9 is offline
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East Penn is also an OEM supplier.
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Old 09-11-2013, 01:47 PM
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[QUOTE=fdriller9;7830836]Why do you want an AGM? QUOTE]

It seems to be the only way to get the >/= 90 Ahr rating from an aftermarket source. I don't explicitly want an AGM. When I go to realoem.com and enter in my cars last 7 of the S/N, the most powerful AGM spec'd for my 335D is a 92 Ahr AGM. True, there is a 90 Ahr regular lead acid one.
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Old 09-11-2013, 01:50 PM
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Quote:
Originally Posted by jburke4689 View Post
My OEM battery is made by Exide. I got it from the dealer but I am sure you can get it from any Exide dealer.
what p/n is the exide one please?
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Old 09-11-2013, 01:52 PM
fdriller9 fdriller9 is offline
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All E9x can be coded for AGM profiles in 56Ah, 70Ah, 80Ah, 90Ah, and 110Ah.

Coding your car for a lower Ah rating that the battery is fine, especially for AGMs. Non-AGM, not so much. The plates will begin to sulfate and decrease battery performance. While AGMs also suffer from being in a discharged state, they are much easier to "repair" by charging the battery a certain way. A quality battery tender will have AGM settings to charge and "repair" a discharged battery.

I use a CTEK 3300.
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  #8  
Old 09-11-2013, 06:37 PM
jburke4689 jburke4689 is offline
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Quote:
Originally Posted by BB_cuda View Post
what p/n is the exide one please?

Exide part# FPAGML5/49

It is 720 CCA 90Ah

Looking at the Exide site, this is the only battery they make that meets the application for the 335d. It is optional on my 335i, maybe a little overkill but the dealer installed it and registered it.
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Last edited by jburke4689; 09-11-2013 at 06:47 PM.
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Old 09-12-2013, 10:55 AM
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thanks jburke. I googled the p/n and found a spec file from Exide. Go to page 4 for the specifications. The battery you got is a group49/AGM. You have independantly arrived at my same conclusion. Only way to get 90 Ahr is group 49 or H8 (same thing) and it be an AGM. I'm curious if the your dealer changed the coding from 90 Ahr lead acid to 90 Ahr AGM. I say this presuming your original battery was lead acid.
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File Type: pdf exide_battery_specs.pdf (2.03 MB, 24 views)
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Old 09-12-2013, 02:02 PM
BMW-bfd BMW-bfd is offline
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BB-Cuda,
Thanks for posting that Exide AGM chart.
I bought the group L-5/49 for my 2007 E91 last month at my local parts store, and was wondering what the amp-hr. rating was. They even had a $20 factory mail-in rebate going on...
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Old 09-12-2013, 06:58 PM
jburke4689 jburke4689 is offline
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Quote:
Originally Posted by BB_cuda View Post
thanks jburke. I googled the p/n and found a spec file from Exide. Go to page 4 for the specifications. The battery you got is a group49/AGM. You have independantly arrived at my same conclusion. Only way to get 90 Ahr is group 49 or H8 (same thing) and it be an AGM. I'm curious if the your dealer changed the coding from 90 Ahr lead acid to 90 Ahr AGM. I say this presuming your original battery was lead acid.
It was lead acid and they did code it. The dealer owed me about $485 from a botched repair. I negotiated the credit and when the battery was 5 years old I used it. It was still working fine but I had the credit and decided to use it.
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