Chapter "Home sweet home"
Once you've progressed to the second floor, you'll have to open a few doors with the green hand energy receivers and eventually you'll come to a door straight ahead and one on your left in which you will see Bobby Bearhug stand in the middle of the room facing you, DO NOT enter the room, instead follow the path through the door which was straight ahead and you'll come around into a side room where you can see Bobby Bearhug, he'll be facing the other door, now grab the battery from a distance and boom, all done !