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When you register the battery.
When you register the battery.
From the 3 series service manual:
Current Mileage is stored
Stored values from old battery (charge status, current, voltage, temperature, etc.) are deleted
Power management is initialized
if you don't:
"[...] the vehicle power management may not run properly and this can lead to function limitations for example: reduction or deactivation of individual consumer functions."
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