[NAV8TT]

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]

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]

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

[Weaselboy]

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

[David1]

Will not make a difference.

[_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.

[E90Fleet]

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_]

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]

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