auto stop start and battery life - BMW 3-Series Forum (F30 / F32)

BMWFB02 · 05-03-2012, 08:10 AM

is having it on would shorten the battery life, I noticed that the headlights get weak for a moment everytime the car starts again.

Elk · 05-03-2012, 08:51 AM

Perhaps a little bit, but starting a warm, primed engine is an easy task for the battery.

The lights dim only because there is an additional load on the electrical system while starting. This is no problem.

robbieracer · 05-03-2012, 09:20 AM

Yes, I'd imagine it would shorten the life of the battery and starter since they're being used a lot more frequently.

Weaselboy · 05-03-2012, 10:25 AM

I popped the battery cover off and noticed my F30 has an AGM battery, so that should help with battery life.

David1 · 05-03-2012, 10:39 AM

Will not make a difference.

_BMWnEwBiE_ · 05-04-2012, 12:35 AM

i would worry about starter because definitely more expensive piece of equipment and more labor for sure. At the same time Batteries always have a longer warranty on them about 84months or so and for 2 to 3 years free replacement anyways after that they prorated.

E90Fleet · 05-04-2012, 10:49 AM

Quote:

Originally Posted by _BMWnEwBiE_

i would worry about starter because definitely more expensive piece of equipment and more labor for sure. At the same time Batteries always have a longer warranty on them about 84months or so and for 2 to 3 years free replacement anyways after that they prorated.

These starters are different from normal ones and designed specifically for Auto Stop/Start.
On them you can also replace the major wear part without replacing the whole starter, unlike most traditional starters.

_BMWnEwBiE_ · 05-04-2012, 11:07 AM

Quote:

Originally Posted by E90Fleet

These starters are different from normal ones and designed specifically for Auto Stop/Start.
On them you can also replace the major wear part without replacing the whole starter, unlike most traditional starters.

Thanks for the clerification that makes a lot more sense. I was really worried about it.

HighlandPete · 05-04-2012, 11:16 AM

Quote:

Originally Posted by _BMWnEwBiE_

Thanks for the clerification that makes a lot more sense. I was really worried about it.

The battery technology seems to be the weakness. E90 series cars don't have too long a battery life before the battery loses charging efficiency and stop/start can fail to function.

HighlandPete

05-03-2012, 08:10 AM	#1
BMWFB02 Major Drives: 2013 ///M3 E92 DCT ZCP Join Date: Aug 2011 Location: The greatest country in the world Posts: 620 iTrader: (0)	auto stop start and battery life is having it on would shorten the battery life, I noticed that the headlights get weak for a moment everytime the car starts again. __________________
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05-03-2012, 10:39 AM	#5
David1 Colonel Drives: 09 E92 09 X5 Join Date: Mar 2007 Location: City With No Room For Ludicris Speed! Posts: 2,121 iTrader: (0)	Will not make a difference. __________________ 2009 335i CoupeLBM - Black Dakota/Glacier aluminum-6spd\|Nav\|M-Sport\|Premium\|Logic7\|Heated Seats\|CA\|BMW Performance Suspension & M3 Control Arms\|M3 lip spoiler 2009 X5 3.0-AW-Black Dakota/Bamboo\|Premium\|Tech\|Cold Weather\|Ipod Rear Climate\| 07 335 coupe - Sold 07 X3 - Sold

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05-03-2012, 08:51 AM	#2
Elk Captain Drives: 2012 335i Join Date: Apr 2012 Location: * Posts: 894 iTrader: (0)	Perhaps a little bit, but starting a warm, primed engine is an easy task for the battery. The lights dim only because there is an additional load on the electrical system while starting. This is no problem.

05-03-2012, 09:20 AM	#3
robbieracer Enlisted Member Drives: 2003 M3 6MT Join Date: Jan 2010 Location: Sacramento, CA Posts: 46 iTrader: (0)	Yes, I'd imagine it would shorten the life of the battery and starter since they're being used a lot more frequently.

05-03-2012, 10:25 AM	#4
Weaselboy Captain Drives: 2012 335i F30 Sedan Join Date: Jun 2005 Location: SoCal USA Posts: 993 iTrader: (0)	I popped the battery cover off and noticed my F30 has an AGM battery, so that should help with battery life.

05-04-2012, 12:35 AM	#6
_BMWnEwBiE_ Enlisted Member Drives: 2012 328i Join Date: Apr 2012 Location: United States Posts: 40 iTrader: (0)	i would worry about starter because definitely more expensive piece of equipment and more labor for sure. At the same time Batteries always have a longer warranty on them about 84months or so and for 2 to 3 years free replacement anyways after that they prorated.