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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.
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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.