New Battery every 2 oil changes

[Ron07x5]

Originally Posted by Investor

Just had my 2014 X5 3.5 serviced and they replaced the main battery. Dealer said it was normal maintenance and would be replaced every 2nd oil change. Car only has 14k miles on it and no battery issues. This sounds absurd to me. I guess I wont keep car once its off warranty. Anyone else have this issue?

BMW has designed a charging system which seeks to recharge a battery as fast as it can be based on .... agm or not, amp hours, and battery age? But this max charging rate stresses the battery. Reason why they do this is to cover for the case where a user drives for short times over and over. What they are apparently seeking is to be able to run the under hood fans to cool hot turbos which may become damaged if not cooled etc.

So BMW is pulling cars in early and replacing batteries that are on their way out from discharge and recharge.

[ard]

Originally Posted by Ron07x5

BMW has designed a charging system which seeks to recharge a battery as fast as it can be based on .... agm or not, amp hours, and battery age? But this max charging rate stresses the battery. Reason why they do this is to cover for the case where a user drives for short times over and over. What they are apparently seeking is to be able to run the under hood fans to cool hot turbos which may become damaged if not cooled etc.

So BMW is pulling cars in early and replacing batteries that are on their way out from discharge and recharge.

Ron you seem to be posting this nonsense in a few places based on who-knows-what...

Now in this thread you read about the turbo cooling and that little factoid is added to you 'theory'

You talked to some mechanic in town and now have the BMW system figured out????

Your assertions appear to have no basis in reality. We know for a fact that the BMW system purposefully does NOT immediately charge a battery after an overnight sit and cold start, to reduce load on the alt and improve mileage/emissions, and instead the intelligent system waits for the engine to warm and enter cruising mode before it loads the alternator. This is precisely why modern BMWs driven for short drives kills the battery- they never get fully charged.

You assertion that they charge super fast and that kills them is nonsense.


I do note in your other post, you knwo a "battery czar" ...BUT you say you need more information.... I will reply there, but why add your nonsense here to this thread if you dont have the full story?