BMW Battery Registration

The electrical system in late-model BMWs is so sophisticated that it tailors charging as closely as possible to both the type and age of the battery. There’s a computer that controls the alternator. When you replace a battery, this computer really needs to know if you’ve replaced the battery or updated the vehicle from a conventional Lead Acid battery to an Absorbent Glass Mat (AGM) type; it charges the AGM differently than a traditional battery.

This process of updating the alternator-control computer is called Battery Registration. Ignoring the registration process after replacing a battery won’t necessarily trigger a Diagnostic Trouble Code or Malfunction Indicator Lamp (‘Check Engine’ or ‘Service Engine Soon’ light). However, be warned that skipping the battery registration process can dramatically shorten the life of a battery in these vehicles and- worse yet- damage components within the entire electrical system.

We have diagnosed some BMWs with failing batteries installed less than a year simply due to failing to have the battery registered! The charging system often shortens the life of an unregistered battery by charging it too aggressively, especially when it is cold, and sometimes damaging other control units. More than once, we have replaced an alternator that failed prematurely because battery registration was not performed when the vehicle’s battery was replaced.

Battery Registration informs the vehicle that the battery has been replaced. It completes the following operations:

· Battery capacity is set to 80%
· Current Odometer reading are stored
· Stored battery statistics (current, voltage, battery charge level) are deleted
· Stored temperature statistics are deleted

The following vehicles require battery registration:

· 2002 and newer 7-Series
· 2003 and newer 6-Series
· 2004 and newer 5-Series
· 2006 and newer 3-Series
· 2005 and newer X5
· 2007 and newer X5
· 2008 and newer X6

Don’t gamble, always have a new battery registered after installation at a BMW-qualified shop; it’s not expensive, and it will ensure a properly operating electrical system. At Munich Motorsport, we have the equipment and the training to properly register your vehicle’s battery to factory specs, ensuring that manufacturer warranty requirements have been met.




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