Quote:
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Originally Posted by Ed P
Hmm... My son had his battery replaced recently, no registration at all (local garage shop did it); no problems at all.
2011 128i.
What are we missing?
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You're missing the registration...
In all seriousness the shop made a mistake, it needs to be registered. Your car is smart, and it alters the way it charges the battery over time to prolong battery health. By not registering it, the car thinks it has (I assume this was the first change, so) a 5 year old battery vs a brand new one. Registration is a simple step to tell the car the battery is new so it prolongs the life. If you changed the amp hour rating or type of battery, this info needs to be coded to the car. There is tons of info about this on both this forum, E90 post, and the internet.