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Technical Topics Mechanical Maintenance and TSBs: Break-in / Oil & Fluids / Servicing / TSBs and Service Bulletin Parasitic Battery Drain?

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      04-11-2020, 09:56 AM   #1
gsantopaolo
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Parasitic Battery Drain?

Hello everyone,
Hope you are doing well.
I noticed a strange (to me) battery drain on the BMW.
Since we went on lockdown, mid-March I tested the battery with a multimeter, and it was like 11.50V after I was not using the car for like a month.
I bought a battery charger, the Einhell CE-BC 6M, and on March 26th, I fully charged the battery, so it was like 12.6V.
Today I rechecked the battery with the multimeter, and it is 12.1V
I was wondering if it can be due to a Parasitic Battery Drain Or if this is normal, and I have to charge it again.

Looking forward to hearing from you and stay safe
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      04-11-2020, 01:49 PM   #2
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Quote:
Originally Posted by gsantopaolo View Post
Hello everyone,
Hope you are doing well.
I noticed a strange (to me) battery drain on the BMW.
Since we went on lockdown, mid-March I tested the battery with a multimeter, and it was like 11.50V after I was not using the car for like a month.
I bought a battery charger, the Einhell CE-BC 6M, and on March 26th, I fully charged the battery, so it was like 12.6V.
Today I rechecked the battery with the multimeter, and it is 12.1V
I was wondering if it can be due to a Parasitic Battery Drain Or if this is normal, and I have to charge it again.

Looking forward to hearing from you and stay safe
Even with the car off and locked, the car still has electronics that are running. The car does self-tests from time to time as well like pushing air through the lines to see if there are any holes.

The battery draining completely normal. These things don't like to sit and if it sits long enough and the battery drains enough, you're going to get a host of warning lights on the dash.
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      04-17-2020, 10:10 PM   #3
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In a quiet garage, if you open the door to my car there is a hum on the inside. I'm not sure what it is, but the car is definitely not "off".
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      04-18-2020, 01:44 AM   #4
bombstar
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Is the hum from the back of the car? My car was having this issue and they traced it to the rear windshield heater having a short because of the TSB for the seal. That said, these batteries drain somewhat fast anyway, so its probably ok.
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      05-30-2020, 05:45 PM   #5
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My m340i already got a battery malfunction warning, the dealer changed one small battery which located in the engine bay passenger side. Everything works again.
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      07-13-2020, 05:26 PM   #6
newway
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Quote:
Originally Posted by gsantopaolo View Post
Hello everyone,
Hope you are doing well.
I noticed a strange (to me) battery drain on the BMW.
Since we went on lockdown, mid-March I tested the battery with a multimeter, and it was like 11.50V after I was not using the car for like a month.
I bought a battery charger, the Einhell CE-BC 6M, and on March 26th, I fully charged the battery, so it was like 12.6V.
Today I rechecked the battery with the multimeter, and it is 12.1V
I was wondering if it can be due to a Parasitic Battery Drain Or if this is normal, and I have to charge it again.

Looking forward to hearing from you and stay safe
I would say it is normal, I average about 50-60mins driving a week and even less back in March-May due to lock down. I noticed recently my auto start/stop never kicks in so I suspect my battery is not full enough.

Last week I used a trickle charger to charge my car, and based on my calculation it took about 30Ah to full. Since the battery volume is like 90Ah, it means it loses about ⅓ of the charge.
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