Take it out at the positive pole, make a circle of holes with a sharp dagger (like a can opener), then insert the knife horizontally and pry it open. Then there is a white rubber ring inside, just pick it up. There is a carbon rod below, but it can't be taken out. There are black things around, and battery liquid. Just clean it slowly with a toothpick. Be sure to wash your hands Some batteries are very toxic. Handle the knife well, too, and don't get the battery liquid on your hand. Hope to adopt