[Bmw doubles]

Just got the discharge battery error. The sunroof is acting up, the halos don't come in when unlocked, seat memory is not working and the mirrors won't unfold sometimes. Haven't check the voltage, but I suspect it's time to change the battery.

Does anyone know the battery specs for our cars? Is it 850cca and 80ah? Also anyone have light weight options since this is an opportunity to do some weight reduction?

[bigshout]

Depends on options spec, my 535i has a 90ah battery, it's easy to check, just pull the boot liner out no you can read the label on your battery.

[EL Jeffe 5]

I had same thing happened to me most of the electronics will act up because it cuts power on most of accessories.
I assume you don't drive your car enough. I would suggest next time you park lock car with remote and that way car will go to sleep
I don't drive my car in winter time I purchase trickle charger from auto zone I hook it up every week over night get battery fully charged.
Good luck

[Bmw doubles]

Originally Posted by EL Jeffe 5

I had same thing happened to me most of the electronics will act up because it cuts power on most of accessories.
I assume you don't drive your car enough. I would suggest next time you park lock car with remote and that way car will go to sleep
I don't drive my car in winter time I purchase trickle charger from auto zone I hook it up every week over night get battery fully charged.
Good luck

I do drive my car often, but I'm only 5 minutes from work. Maybe it's time to start walking and pull up on a mustang with my Nikes

[EL Jeffe 5]

Originally Posted by Bmw doubles

I do drive my car often, but I'm only 5 minutes from work. Maybe it's time to start walking and pull up on a mustang with my Nikes

yeah thats not nearly enough to charge battery
I also work 10 min from my job thats why I bough battery charger quick connect
every week or two I just charge over night No more issues.

[Bmw doubles]

Ok so found new things out. Its 850cca 92ah is the spec of my battery. Went into the secret menu and voltage showed 13.3 when the engine was running. Oddly enough when it was not running it showed 12.2

Wonder if its my alternator. If it was wouldn't that throw a code?

Have it hooked up to the BMW trickle charger so we'll see in about 13+ hours is that works

[eghmsport]

I have a 2011 550i so my situation may be a little different. I would get low battery message from time to time when it was cold. My voltage was fine when I started my car after it had been sitting over night. It would stay around 13.4 to 14.4 volts while I drove. I noticed that after I had driven a while, if I shut my car off then restart it, the voltage would drop a little. It eventually became bad enough that I would only see around 11.2 volts. My alternator was going bad. My battery was already 4 years old so it went bad as well. I had replace both in a 2 week span but all is good now. I did not have any codes from the bad alternator either.

When I installed the new alternator, I noticed that my turbo coolant lines were leaking and dripping on my alternator. I also changed the clamps on the coolant lines too, I believe the leaking coolant found its way into the alternator causing it to go out.

I used the 95 amp AGM battery from Advance Auto that was around $220.00.