Just the other day, as we were driving in the car, Ben started shouting from the backseat, "Moo dad-der-y." It took a few guesses and loud "NO"s in response before I landed on new battery. Sure enough Ben's light was orange and a battery was going out.
He has also started replacing his magnets when they fall off. In the past, he would take the whole processor off and give it to us. Now, he can gently reach up and fish around for the magnet to stick.
I can picture the day when Ben's 'ears' will sit on his night stand and he'll stick them into place all on his own when he wakes up each morning- without thinking a second thought.