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here´s an excerpt from the instructions given in "Rheingold" (couldn't copy/paste it but re-typed word by word):
"After installing a new battery, the service function "register battery replacement" must be run. the registration of the battery replacement is required to inform the power management (software in engine electronics and intelligent battery sensor) that a new battery was installed in the vehicle. If the battery replacement is not registered, the power management will not function properly and can lead to functions being limited by individual electrical consumers being switched off or having their power reduced, for example"
"registering" as per the service instructions in "Rheingold" means that a battery with a different capacity must be coded into the CAS, as well as a change in battery type (lead-acid vs AGM), and the service function "Battery" must be run (ISTA/P) and the power management system be initialized.
after the new battery is in, the vehicle must sit for at least 3 hours for the power management system and the battery to learn to like each other...
so i think this sums up what has been said before: not registering might screw up the power management and the procedure may indeed be overengineered.
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