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      01-08-2019, 04:35 AM   #1
lefthander
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F30 328i Idling/Driving voltage

Can some mates here check for me what's their car idling and cruising voltage?

No matter what situation, my 5 years old battery voltage range from 14.7-15.0 despite that I drove only 3 miles on some days. Just worried that the battery toasted or alternator is overcharging it. Any feedback of voltage values is appreciated!

Lefty.
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      01-08-2019, 07:49 AM   #2
Billfitz
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It's normal for an older battery to be charged to higher voltage than a newer battery. The car does that to compensate for the loss of current capacity with an older battery. Where you run into a problem is if you put in a new battery and don't register it. Then the car will charge the new battery as if it was an old battery, which can damage it.
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      01-08-2019, 11:21 AM   #3
lefthander
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Thanks!
Any mate can just help and post some cruising voltage would be great.
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      01-29-2019, 06:28 AM   #4
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In the winter my idle and cruse voltage is 14.XX. Sometimes is the summer the voltage will be 13.XX. Been like that since brand new.
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      01-29-2019, 07:21 AM   #5
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I haven't paid that much attention to mine in summer, but I have no doubt that the car is smart enough to know that there's less drain on the battery in warmer temperatures, so it reduces the charge voltage accordingly.
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      01-29-2019, 07:34 AM   #6
HighlandPete
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Quote:
Originally Posted by lefthander View Post
Can some mates here check for me what's their car idling and cruising voltage?

No matter what situation, my 5 years old battery voltage range from 14.7-15.0 despite that I drove only 3 miles on some days. Just worried that the battery toasted or alternator is overcharging it. Any feedback of voltage values is appreciated!

Lefty.
14.4V is typical in my car. ~14.7V on the over-run, if the SOC has dropped due to little use.

Energy management can go above 14.8V (normal maximum), if necessary, to charge an AGM battery. BMW state a 14.0V to 15.5V range, in the technical data.

Your low use could well be the reason for the higher voltage, SOC is low and maximum voltage is used to get the best charge performance.
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