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#1
12-04-2023, 06:58 PM
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Dual battery question
When I use BimmerLink the car shows having a 90ah battery. Seems like whoever replaced the batteries didn’t re code the system to 50ah. Would this cause electrical issues/error codes? And could I simply recode it to 50ah or would this mess things up? TIA  Sent from my iPhone using Tapatalk Last edited by andrew.nelson08; 12-04-2023 at 07:20 PM. 
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#2
12-04-2023, 09:43 PM
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What the heck? I thought the dual battery setup is supposed to be 2 12volt batteries! Does this look factory?
The TIS says 1 battery mainly for starting duty and the other for accessories.
__________________
1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me)
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#3
12-04-2023, 10:18 PM
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Dual battery question
Here’s the other side, I don’t think it’s factory. The IBS system is on the other battery. It looks professional but I’ve noticed other cutoff wiring splices (presumably from a stereo)so figure someone changed something around.
Sent from my iPhone using Tapatalk 
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#4
12-04-2023, 11:08 PM
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Yeah, that's a bit of a kludge and that is a fair bit of corrosion on the distribution connector. I would put it back to original with 1 12v Delco pro AGM. At the very minimum load test the batteries and clean up the connections.
And yes, you only have 50A hrs with both in series for 12 volts.
__________________
1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me)
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#5
12-04-2023, 11:13 PM
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So for a stock set up the IBS connection is on this side as well? Is it obvious where it connects onto this hodgepodge?
Sent from my iPhone using Tapatalk
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#7
12-04-2023, 11:20 PM
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Hmm interesting. Thanks for the input.
Still curious if the vehicle having a 50ah battery but thinking it’s running a 90ah would cause electrical demons… Sent from my iPhone using Tapatalk
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#9
12-04-2023, 11:30 PM
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Strange. Thanks!
Sent from my iPhone using Tapatalk
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#10
12-05-2023, 12:19 AM
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If you only have 50Ah, yet the car thinks it is 90Ah, it will not charge properly. It may, in fact, be over-charging at times.
The E70 charging system is too cute by half- I would return it to stock: AGM, 12 V, IBS in the right place.... system coded accurately to the battery installed. Edit: Ive seen some hackery in my time, but this one is...wow...something!
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