When your battery needs to be changed in your tracker, just follow these three steps:
1. Locate your "battery key," which is in the tin that originally housed your tracker.
2. Line up the key with the holes on the back of the tracker and turn counter-clockwise about one-half turn, or until you are unable to turn it anymore.
3. Gently use two hands to push on the opposite side of the battery opening and replace with new CR2430 lithium coin battery (also known as a "button battery").