Gateway GCM-4 - Manual (Page 91)

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3 Press the battery toward the far side of the jukebox, then lift the
battery out of the jukebox.
4 Insert the replacement battery into the battery bay, making sure the
contacts on the battery align with the contacts in the battery bay.
5 Replace the battery cover.
Caution
Never shake the jukebox to remove the battery. Shaking the
jukebox will damage its hard drive.