I agree 100% about registering the battery. This needs to be done because car's electronic management system needs to process the information that a new fully active battery has been installed and optimum "current draw" has been restored. Or else, all the electronic systems will keep working as if the car still had old battery, and the "current draw" is not normal. In simple words, the process will "erase the history" or "clear the codes".
Please don't dismiss these suggestions as dealership trying to get you or else. They'll save you a lot of headache.
So, I ask myself the question, what today..... what tomorrow?