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Old 08-15-2014, 01:19 PM
srrav1981 srrav1981 is offline
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Location: Austin TX
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Mein Auto: 2007 328xi
Battery questions and Registration. 2007 328xi

Hi all, Iíve been a lurker on these forums for the last few years and finally felt like I needed to ask some questions because Iíve found mixed answers in the existing post.

I have a 2007 328xi with 60k miles on it. Iím assuming the battery is the original but donít see a date code on it. Iím the 2nd owner of the car so I have no idea if it was ever replaced previously. Itís a white top BMW branded battery. Any idea where the date code would be?

Question/Problem 1:
About once every 3 months, right after I shut the car off but still have the radio on with the doors shut I get the BATTERY icon pop up on my dash. Iíll get the icon within 10 seconds of stopping the engine. All other times I can park, turn the engine off and leave the radio on and never get the icon and have even sat long enough to where the 15 minute mark hits and the radio goes off. Iíve never had problems starting the car after the battery light comes on or even when Iíve left the car sitting for 3 weeks while out of town. The reason Iím asking now is it happened again today and when I went to restart the car, the center area that indicates the FOB is present and shows the KEY icon looked DIM like the battery was drained but when I pushed the button it fired up like normal. I ran the systems check and everything came back ok.. Should I be concerned with the battery?

Question 2:
Replacing the battery yourself and Registering it? There seems to be mixed answers on this in the forums. If I replace my battery with one from AutoZone/Battery+ or any DIY store and can match the specs do I really need to ďregisterĒ it? Half the people say they havenít and have driven for year(s) without problems while others say theyíve had a ton of problems and the problems went away when they registered it. Granted most of those post have been 2-5 years old so Iím asking about it hoping there is new information about this. I know an independent BMW mechanic who can probably do it in 5 minutes, just trying to find out if I really truly need to do this because I donít know what his cost would be. I also donít know if he would allow me to replace it myself then drive to him for the registration or if heíd require me to buy the battery from him and he install.

Any advice would be welcome and thank you!
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Old 08-16-2014, 09:43 AM
Tom K.'s Avatar
Tom K. Tom K. is offline
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Location: Maryland
Join Date: May 2008
Posts: 3,039
Mein Auto: '07 328iT.'13 Boxster
(1) When that and some other odd electrical issues began occurring on my '07 E01, the problem turned out to be an intermittently bad IBS unit which was causing an overcharge. The original battery went south a few months later and was replaced by an OEM battery and registered by the dealer. No electrical problems since.

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Old 08-16-2014, 02:21 PM
fdriller9 fdriller9 is offline
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Location: NJ/Philly
Join Date: Oct 2006
Posts: 7,891
Mein Auto: '06 AW 330xi
You can buy a battery from any auto parts store and have it registered. You can either find someone local to do it for you or go to an indy to do it. Anyone who can code, will have the ability to register batteries.

It should not cost more than $50 to register a battery. It only takes 3-5 minutes and the majority of that time is to hook up the diagnostic equipment and go through the menus. If they charge you more, they don't know what they are doing or are ripping you off. A dealership will charge you an hour of labor to register a battery.

As long as you keep the same specs as your current battery, all you need to do is register it. If you change spec, you have to program, then register.

The most important part of battery replacement is making sure you keep the same TYPE of battery. You can either install a normal, non-AGM battery or an AGM one. They charge differently and this is why it's important to keep the same type. Ah and CCA ratings should be similar but it won't matter as much as type. For instance, I replaced my OEM non-AGM with an AGM 90Ah. I programmed my car as a 70Ah AGM when I put a lightweight Braille battery in there for a year. It struggled to start my car in the winter so I replaced it with a 90Ah AGM and kept the programming as a 70Ah AGM.

My battery has been fine since I installed in 2010.

And just FYI, OEM non-AGM batteries are white. OEM AGM batteries are black.

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