Insightful the battery compartment door Secure with the screw | To remove the battery, remove the door, win the luge upsides down and tn the lever and the battery will eject {picture #3), HOW TO INSTALL THE BATTERY ADAPTER To use the battery adapter, install 4 new AA alkaline batteries. Follow the diagram inside the adapter. (picture #4). install battery adapter in the street luge as shown in picture #2.