Be extremely careful when removing the battery cover from the device.
With the device facing away, gently pull and remove the battery cover (prying with finger at the top-right corner of the device). Please use extra care when removing the battery cover so as not to damage the cover.
Align the gold contacts of the battery with the contacts in the battery compartment then gently press the battery into place.
Align, starting at the bottom, then gently press to snap the cover into place.