![]() However, be advised 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. 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). This process of updating the alternator-control computer is called Battery Registration. When replacing a battery, this computer needs to be informed 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. The Engine Management computer also controls the alternator output. The electrical system in late-model Minis and BMWs is quite sophisticated, in that it tailors charging as closely as possible to both the type and age of the battery.
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