Someone more knowledgeable may provide a better answer. My understanding is that as the battery ages, the capacity lowers (let's say 1/2). The car's computer adjusts for the lower capacity by recharging until that lowered capacity is reached and not anymore. Since the new battery is at full capacity, the car's computer will continue to recharge until 1/2 of the new batteries capacity is reached. You can certainly not register the battery, you may be shortening the life of the new battery by not registering it.