11-27-2018, 09:58 PM | #1 |
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Battery replacement vs electric issue?
I just got a 2012 335i in Aug '18. About a month ago I got a battery discharge warning. Now I have to use my jump box every other day, sometimes once to go to work and once to get home 30miles highway each way. Currently stock, no mods at all.
Battery specs = Super Start model 48ECO. Battery date 6/18. CCA@0*F 615, CA@32*F 755, 20 Ah rate, 65. Labeled as STD Pb, I think that means lead acid type. Looks like a group 48 series, if that means anything special? Google says it's from Orielly auto parts if that helps. I got the battery and alternator test at autozone. Both say everything is good. I got a trickle charge unit for over night charging and started reading threads for possible solutions or ways to diagnose for a serious electrical issue. Not sure I'm asking the right question or searching the right topics? Called the local dealership today and got a quote for $570 to replace and code. Then found a coupon for 75 off the battery replacement. So $495 out the door. I definitely don't want to go this route at that expense if there is a deeper underlying electrical issue. Does anyone have any ideas? Thinking of getting the carly app to ensure the coding is right for the battery installed. Maybe new AGM battery as well. Sorry for the long post, if there's a thread with similar issue I couldn't find it. Thanks in advance. |
11-27-2018, 10:21 PM | #2 | |
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11-27-2018, 10:22 PM | #3 |
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That is the wrong battery.... F30's use AGM batteries. The CCA's are also too low.
The 92 amp hour battery for the F30 is 850CCA. Get the correct battery. You can get one from Autozone
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11-27-2018, 10:23 PM | #4 |
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Duralast platinum for $190. I'm sure you can find a discount/coupon somewhere.
https://www.autozone.com/ignition-tu...8_300932_25697
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11-27-2018, 11:07 PM | #5 | |
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It's a f30. Were they both produced in 2012? Would explain the confusion when searching for the correct cp, fmic, and dp and getting 2 different part numbers and designs.
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Also, where can I find specs like this? I searched the mighty Google and this forum for spec sheets. Just in case I need info for other parts in the future. |
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11-27-2018, 11:37 PM | #6 | ||
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It could explain the different part numbers, but those can also be explained by RWD/AWD or Manual/Automatic etc. Quote:
Second, the F30 335i could possibly have a 70ah, 80ah, 90ah or 92ah in it depending on a number of factors. 20ah or 65ah isn’t going to do it. No wonder you need a jump everyday. Unfortunately even a BMW Dealer cannot tell you which battery was originally in your car via anything in their database with one possible exception. If the battery was previously replaced (as a 2012, a good chance), they might be able to look at the previous work order to see what it was replaced with. On top of the above, the car has to be coded for whatever ah is installed. And registered when a new battery is put in. And as stated, with the wrong battery is in your car now, God only knows which of the 4 batteries should really be in your car. A dealer (or anyone with ISTA) can tell you what the cars computer thinks is in there. Given the wrong battery is in the car there is a chance that they did not update the info either...but then again, no way to know. FWIW, in ISTA to read thebattery size and registration from onboard electrical system: ISTA->Service functions->Body->Voltage supply->Register_battery replacement->Test plan Last edited by IK6SPEED; 11-27-2018 at 11:46 PM.. |
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11-27-2018, 11:46 PM | #7 |
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If I’m reading your post right, your current battery is 20 AH? The specs in general do look low, but 20 AH (if correct) would be the cause of you needing to jump start every time. You need either group 94R or 49 (group 49 is slightly higher spec) in AGM, minimum 80 AH.
Here’s the battery I bought for my 335i a few months ago with the specs below. https://www.batteriesplus.com/productdetails/sli49agm Brand: Duracell Ultra Voltage: 12 Format: BCI Group 49 Lead Acid Type: Deep Cycle, Dual Purpose (Starting/Cycling), Starting Cold Cranking Amps: 850 Battery Type: Premium Capacity 20hr: 92AH Chemistry: Lead Acid Cranking Amps: 975 Lead Acid Design: AGM |
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11-28-2018, 07:37 AM | #8 |
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Wrong battery!! Can't imagine a dealer putting that battery in. Sounds as if the previous owner did a cheap quick replacement from an auto-parts store just to sell the car. Probably did not register that battery either. Wrong battery plus no registration= your problems.
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11-28-2018, 08:17 AM | #9 |
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A dealer isn't going to O'Reilly Auto Parts for a battery. I doubt it's a 48 series, which won't fit in the car. They do make a 49 series that fits, but I doubt whoever put it in registered it.
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11-30-2018, 06:52 PM | #11 |
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Ok, got the new battery (H8 from autozone). Is there a quick way to get the Carly OBD2 Gen 2 adapter? looks like shipping is going to be a few days and I don't want to put the new battery in a mess it up.
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12-01-2018, 10:03 AM | #12 |
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12-01-2018, 11:07 AM | #13 |
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The battery won't get messed up in the short term if not registered. What happens is that the car doesn't know it's a new battery, so it charges it as if it was an old battery, installed on the date when it was registered, which could be as far back as the original battery in-service date.
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12-04-2018, 08:38 PM | #14 |
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Ok, so the new battery has been installed for about 4 days. Today the car died again and got the battery discharge warning, charge needed. Had to jump it. When I got home ~30mile drive, the temp gauge was just at 250* (have not seen it above ~220 before) and got the warning that the engine compartment was hot. When I opened it a small amount of steam or oil or something was floating about.
Now I'm just lost on what to check. |
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12-05-2018, 07:36 AM | #17 |
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That's a possibility. Since the #1 job of the battery is to start the car the power management system makes that a priority. One of these plugged into the console lighter socket will let you see the state of charge while driving and with the engine off.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 |
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12-05-2018, 11:49 AM | #20 |
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I think it may be the steering wheel heater or the seat heater. I may try to find the fuse and pull it to see if the battery lasts.
It's the only thing I can remember using both times the battery did the discharge warning. |
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12-05-2018, 01:56 PM | #22 |
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I'd imagine they should turn off as accessories. Does the Carly app show battery usage and the reason for discharge logs? If there is a short somewhere I think that would be easy to find, but everything seems to run normal.
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