An electronic device includes a battery and a housing whose battery compartment has a main surface and a pair of side surfaces. The main surface is configured to face the bottom surface of the battery and the side surfaces are configured to face the respective side surfaces of the battery. Each of the side surfaces has a guide rail for the battery. Each of the guide rails has a first end at a primary end of the housing and a second end. Each of the guide rails is inclined such that the distance between the first end of the guide rail and the main surface of the battery compartment is greater than the distance at the second end.