Remove the original battery and replace in with the new battery [http://https www.amazon.com Battery-Xperia-Tablet-SO-03E-SGP312JP dp B002NE4YPS]

Reconnect the battery into the port

Screw the battery back into place

Reconnect both wires that cross over the battery into their ports

Place the plastic cover back on (Make sure it clicks into place) and then strew the cover back into place (Do not forget the two screws at the bottom of the plastic cover)

Put the charging port cover back on

Put the headphone cover and the switch cover back into place on the side of the tablet

Finally, take the black plastic cover and push it back into place