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      11-27-2011, 03:55 PM   #1
twinship
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Battery warning light - replace now?

I've had the battery warning light come on 3 times over the past 2 days.

So far, no issues with car starting. But I'm wondering if it might not be better to replace the battery now... instead of waiting for it to fail at an inconvenient moment.

Car has been in service for ~4 years, and battery is original.
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      11-27-2011, 04:41 PM   #2
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I would replace it now. The light is going off for a reason. The battery may not be charging properly. Double check the owner's manual to make sure it is the battery warning. IN addition to showing a battery icon, the color (yellow/red) might mean a different problem.
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      11-27-2011, 06:01 PM   #3
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Thx, wasn't aware that there are 2 different battery warning lights, red & yellow. Mine is yellow, meaning a "very low charge."

Guess that means a trip to the shop to at least have it diagnosed.
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      11-27-2011, 09:13 PM   #4
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Battery life is only about four years

If you are still under warranty then it is a quick fix

If not, you can pick up a replacement at walmart and DIY or grab an 85 month Interstate AGM and install; you then have to code for an AGM which increases the charging voltage from 14.4 to 14.8.
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      11-27-2011, 10:59 PM   #5
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If you do change the battery, make sure to get it registered.
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      11-28-2011, 10:14 AM   #6
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Thx for the tips.

1st time replacing a BMW battery -- wasn't aware that it needed to be registered.
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      11-28-2011, 12:26 PM   #7
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Quote:
Originally Posted by twinship View Post
Thx for the tips.

1st time replacing a BMW battery -- wasn't aware that it needed to be registered.
Registering the battery insures proper communication with the IBS unit (Intelligent Battery Sensor) which controls the charging rate.

When my '07 E91 displayed a BATTERY LOW message, a malfunctioning IBS was found to be the cause, so have it and the alternator checked out before replacing what may be a good battery.

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      11-29-2011, 11:10 AM   #8
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Can some one explain me how to registered the battery.

Thanks
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      11-29-2011, 11:27 AM   #9
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Quote:
Originally Posted by phatr1s View Post
Can some one explain me how to registered the battery.

Thanks
Any BMW dealer can handle it for you.

Tom
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      11-29-2011, 01:37 PM   #10
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Update on this...

Got a new OEM battery at an independent shop. $199 for the battery + $115 labor, including coding to the car (they're BMW specialists).
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