New battery
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From: Augusta, GA
My Ride: 22 BMW 540i xDrive; 05 BMW 530i
Engine: 3.0 B58; 3.0 M54
There's 2 things you do when replacing a battery (code it and register it). Every battery needs to be registered. Registering tells the car there is a new battery installed. Coding tells the car there is a different size Ah battery installed. If you change the battery size it needs to be coded and registered. If you are putting the same battery size in then it only needs to be registered.
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From: San Diego, CA
My Ride: '06 530i N52
To be more specific; when you install a new battery and register it, it tells the ECU to reset the charge Slope for a new battery. As the battery ages, the ECU adjusts the charge Slope accordingly. If you use the old Slope on a new battery, it could shorten the battery lifespan and also affect your MPG. People who do not care about those factors choose not to register their battery.
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Joined: May 2021
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From: Bedworth
My Ride: 5 series gt
To be more specific; when you install a new battery and register it, it tells the ECU to reset the charge Slope for a new battery. As the battery ages, the ECU adjusts the charge Slope accordingly. If you use the old Slope on a new battery, it could shorten the battery lifespan and also affect your MPG. People who do not care about those factors choose not to register their battery.
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