[Kalimanjb]

Originally Posted by JamesM3M5

Don't forget to register the battery replacement in the ECU. The ECU has a charging profile based on battery age. The older it is, the more the alternator puts out. If you don't, the new battery may get overcharged and it will crap out early. I've heard reports of new batteries getting killed from overcharging within 3-6 months if battery replacement is not registered in the ECU. Must be done with a BMW diagnostic computer that can code modues such as GT1, Autologic, or INPA cable.

Thanks great info