Originally Posted by Deathkut
Back in February I replaced my battery, I keep reading things that suggest that replacing a battery requires going to a dealer to let them program the new one to the car.
Do I need to register the battery even after this long with not doing so?
According to my SA and Mike Miller of BMWCCA, registering the battery informs the IBS how to control the rate of charge. Obviously, undercharging will deplete the battery, but overcharging can damage some of the electrics. On my '07 E91 a bad IBS was calling for 17.5 volts, which ultimately resulted in a damaged JBE as well as a failed battery.