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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > How long should the Battery last



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      11-09-2009, 12:37 PM   #1
mds82
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How long should the Battery last

Hey everyone

How long should the OEM battery last you? I have a '06 build and have had it for 4 years now. I drive everyday for about 30-40 minutes at least. Lately its been getting low and sometimes sluggish during start up. Should i just throw the trickle charger on the battery or do you think its time for a new one?


Thanks!
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      11-09-2009, 12:41 PM   #2
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IIRC 4-6 yrs
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      11-09-2009, 02:38 PM   #3
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Get a new battery. Charging is just putting it off and will leave you stranded when it finally croaks. Four years is not bad for a battery.

In the CA desert, I have gotten as little as two years on batteries.
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      11-09-2009, 02:41 PM   #4
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Get a new battery now. Ive been dealing with a shotty battery for a while now, its no fun not knowng if your car is going to start.
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      11-09-2009, 02:57 PM   #5
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3 years for the original battery in Arizona.
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      11-09-2009, 04:41 PM   #6
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get it while ure under warranty. FREE
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      11-09-2009, 06:49 PM   #7
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I am surprised you got 4 years out of your battery. Mine was died after 3. Get a new battery before you end up stranded.
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      11-11-2009, 10:23 AM   #8
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it should be roughly 3 years
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      11-11-2009, 10:26 AM   #9
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One tip, while it may cost more, I would have the dealership do it. The registration in the DME makes a large difference when it comes to charging. If you dont tell the car it has a new battery, it will die much quicker.
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      11-11-2009, 10:36 AM   #10
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All depends. My wife's Brand new Merc ML 350, couple months old just went bad sitting in the garage, it had a bad cell. Rare occurance but it happens from time to time. Typically around 3-5 years is what I have noticed tho.
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      11-11-2009, 11:45 AM   #11
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Quote:
Originally Posted by SpmnE9zero View Post
All depends. My wife's Brand new Merc ML 350, couple months old just went bad sitting in the garage, it had a bad cell. Rare occurance but it happens from time to time. Typically around 3-5 years is what I have noticed tho.
Yeah, that is just an odd occurrence. I assume they replaced that battery for free.
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      11-11-2009, 11:48 AM   #12
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Quote:
Originally Posted by FCPGroton View Post
Yeah, that is just an odd occurrence. I assume they replaced that battery for free.
As long as the energy diagnosis says its the battery at fault. The tech has to run a test plan with the diag equipment, and it decides if the battery is warranty or not.
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      11-11-2009, 11:53 AM   #13
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I have has a battery die on my after a couple months and it was just swapped no questions asked.
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      11-11-2009, 12:27 PM   #14
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mine is onto its 5th year.........
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      11-11-2009, 12:50 PM   #15
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Sorry for long post - Bottomline question is what battery voltage do you see hours after shutting down?

When do you guys call a battery being bad? comfort access options don't work, or yellow battery warning light, or actual battery voltage (multimeter) readings?
Reason for my question is my "efficient dynamics" battery charging don't work. It's a minor thing to me but it just annoys me every time i see the "efficient dynamics" adds. I have the dashdyno OBD reader stashed away in the ashtray, the thing can do plots, and i can see i doesn't work as it is supposed to be. Now that can be related to my battery being bad, but the dealer is not of much help..
My battery reads 12.1-12.2 V in the morning before start using a decent (Fluke) multimeter. batteryuniversity.com will tell you that's no good. A BMW SIB refers to batteryuniversity.com. But BMW is not replacing my battery yet.
PS: a major hickup (in my view) is that on whatever BMW does in the workshop on a E9x, they hook it up to the charger first - standard procedure. If you ask me it screws up the IBS history (inteligent battery sensor = black bit on negative battery terminal with a red wire leading to it (actually has IBS stamped on it if you have it))
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      12-02-2009, 11:14 PM   #16
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I hooked a voltmeter to my car in the summer and that read 12.1 volts in the summer. Its winter now and the voltage is about 11.9 volts now. I got a battery charger and charged the battery through the terminals under the hood and got it up to 12.9. i unplugged it, let the car sit overnight, but the voltage was back down to 11.9 the next morning. You'd think I'd have to replace the battery, but I've heard the computers drain the battery. I also have comfort access which may also add an additional strain to the battery. I decided to take the battery out and charge it without it being hooked up to the car. Right after i took it out, i tested the voltage and it was at 12.5. The car itself was sucking up a chuck of the battery. Does this mean that once the battery is at 11.5 volts while hooked up to the car, i should get it replaced?
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      12-02-2009, 11:18 PM   #17
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I still think you should look into getting it replaced either way. 7 years is a very long time on a battery. It looks like the battery is still ok right now but for how much longer is the real question.
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