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      07-14-2015, 09:32 AM   #1
The Beast (750Li)
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Angry More N63 bad news? So solution to battery charge flaw

So the BMW engineering solution to the battery charge design flaw -- it only charges during braking, by design, and not at other times which represent 99% of the use case of US drivers and they did this to get better gas mileage numbers -- is to replace the battery when they change the oil.

Do we have an option of getting worse gas mileage (the reason this design was implemented) to hold on to the battery?

I am going off warranty end of year and a new battery at every oil change adds some $600 to the costs if I adopt that solution. I'm already dusting off the trickle charger I used to use for the always out Wrangler.

Last edited by The Beast (750Li); 07-18-2015 at 05:17 PM..
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      07-14-2015, 03:30 PM   #2
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Only $600 and enjoy, that is great!

PS, way better than last time I spent for my Mercedes $2800 for the same problem
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      07-16-2015, 07:16 AM   #3
The Beast (750Li)
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Quote:
Originally Posted by Fanta View Post
PS, way better than last time I spent for my Mercedes $2800 for the same problem
I've owned a fair number high end Mercs -- coupes, sedans, SUVs. It was how Mercedes US handled the chronic body rust problem on the mid-00 MLs that drove me to explore owning alternatives, like BMWs. I *never* saw a fumble at this scale.
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      07-16-2015, 09:32 AM   #4
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Quote:
Originally Posted by The Beast (750Li) View Post
I've owned a fair number high end Mercs -- coupes, sedans, SUVs. It was how Mercedes US handled the chronic body rust problem on the mid-00 MLs that drove me to explore owning alternatives, like BMWs. I *never* saw a fumble at this scale.
I towed my Mercedes to a Mercedes Dealer in Ottawa. They want me to buy a new car instead of repair it. GM told me, "Why don't you buy a new Mercedes and instead of fixing such a old car!".
I replied " If you cannot repair my old car, how do I know you can repair a new car."
After 1 month, they gave me a $2800 invoice all because of power seat problem and cause the battery dead.
I pay my invoice and drove to a BMW dealer and buy a brand new 740iL.
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      07-17-2015, 05:47 PM   #5
BMWrules7
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Quote:
Originally Posted by The Beast (750Li)
So the BMW engineering solution to the battery charge design flaw -- it only charges during coast, by design, and not at other times which represent 99% of the use case of US drivers -- is to replace the battery when they change the oil.

Do we have an option of getting worse gas mileage (the reason this design was implemented) to hold on to the battery?

I am going off warranty end of year and a new battery at every oil change adds some $600 to the costs.
Well, its not really that bad. Although, some garage queens and some low miler folks will experience a shortened battery life, folks in this situation can trickle charge the battery.

The benchmark for most batteries in the northeast is 24 months. So, if you can eek 24 or more months out of your battery then you're doing pretty well.

Every BMW I have had except one was able to extract 36 months on the battery.

Also, the battery does not charge during coasting (unless the battery preservation logic kicks in).

The battery primarily charges during braking and engine braking.
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      07-18-2015, 05:19 PM   #6
The Beast (750Li)
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Thanks -- voice of reason. Fact that they recommend the battery change doesn't mean I need to do it LOL
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