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BMW 3-Series (E90 E92) Forum
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Battery AGM or not
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09-29-2015, 08:34 PM | #1 |
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Battery AGM or not
So I need to change my battery pretty soon.
Currently I have a acid battery. Can I put a agm or do I have to buy an acid battery? I can program and code it and register it myself. Car is a 2007 335i Sedan. Production month sept 06 with FRM1. If this matters. Greatly appreciate the response. DN |
09-29-2015, 08:55 PM | #3 |
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09-29-2015, 09:10 PM | #4 |
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Be aware that the charge profile for AGM is quite different than lead acid battery...the voltage tolerance is lower. So if you fail to code your car to know it needs to use an AGM charge profile, you risk shortening the life of the AGM with excessive voltage.
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09-30-2015, 12:12 AM | #5 | |
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Works for reading codes. Judy haven't got around to fooling around on coding yet. D |
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09-30-2015, 07:42 AM | #6 |
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The price difference for the AGM battery vs. the lead acid is usually at least $40, plus coding.
Since the original lead acid E90 battery tends to last 5-6 years, I think for most people a regular replacement lead acid battery probably works just fine. If you are not 'regular' and tend to live in a very cold climate, leave your car stationary for over a week, or need lots of non-engine running electrical capacity, AGM is probably a good move. Or if you really want a weight reduction, you can go with a lighter battery of the same power by going AGM.
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09-30-2015, 10:58 AM | #8 | |
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Did you code it before swap or after swap? Never used Carly for coding yet, Judy scared itmight cause more issues. DN |
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09-30-2015, 01:55 PM | #9 | |
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*Note: at the time of install, my friend had me coded from a FLA 90AH --> AGM 90AH battery and we updated the VO as well. |
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09-30-2015, 09:24 PM | #10 |
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09-30-2015, 10:09 PM | #11 |
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10-01-2015, 01:30 AM | #12 | |
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Voltage output?.... Guess. DN |
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10-01-2015, 12:47 PM | #13 |
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VO = Vehicle Order number.
Basically if the delership or anyone else desides to blow away all my custom coding in the car.... the VO tells you what to "restore" the settings to (Kinda like the stock factory settings). So besides changing the setting in the car to the AGM profile... you want to update the VO so that if someone resets the coding... it should default to a 90AH AGM instead of the 90AH FLA that came with the car (In my case). Let's say you changed your battery from a FLA 90AH to a FLA 60AH battery. You will want to code the car to let it know to use the 60AH profile for a FLA battery. But if you don't update the VO and someone blows away your coding... and restores the stock settings based on the VO, it will go back to a FLA 90AH. Had you updated the VO to reflect that the correct battery to use going forward is a 60AH FLA battery, then you can't have that mistake happen on accident. I hope i explained it correctly, please ask more questions if you are unsure what i mean. Last edited by fazman; 10-01-2015 at 12:53 PM.. |
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10-01-2015, 09:19 PM | #14 |
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10-01-2015, 10:17 PM | #15 | |
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DN |
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10-02-2015, 12:17 AM | #16 |
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10-02-2015, 03:55 AM | #17 |
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10-02-2015, 05:30 AM | #18 |
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I just changed my battery...laster 6 years, 10 months.
I Dk the difference between AGM and Lead Acid but I replaced mine with an Advanced Auto Parts Autocraft Gold 49, 900 CCH 95 AH. Bought online for $166-30% off code I found online...then had my Indy register it...$45. Done.....I highly recc. this battery. |
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10-02-2015, 11:54 AM | #19 | |
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Comparing equal size batteries (which is the only fair comparisons): - Lead acid has more storage capacity - Lead acid weighs less - Lead acid costs less Where is the advantage to AGM in our application? |
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10-02-2015, 12:34 PM | #20 | |
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10-02-2015, 05:34 PM | #21 | |
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http://batteryuniversity.com/learn/a..._glass_mat_agm |
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10-02-2015, 06:28 PM | #22 | |
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BTW, I thought when I instal;led the new one that I have all sorts of codes, errors and lights....nothing of the sort...ran like it was new. Just get it registered and you're all good. |
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