Place the copper tape on power terminals

The final step is to bridge these parts in the back cover with your S3's battery. For that, you'll need to grab the copper tape. To make this process easier, prepare four 1/8"Wx1"L strips of copper tape.

On the L-shaped part of the circuit board, you'll see two raised power terminals. Grab a strip of copper tape, and fold over about 1/8" of one end. Place the folded-over end on the top power terminal, sticking the rest of the tap down so that it reaches the edge of the backplace. It should basically be parallel with the bottom edge of the backplate.

Then, take another strip of copper tape and fold it over the same way, placing the folded-over edge on top of the bottom power terminal, but this time, stick the tape down diagonally toward the edge of the backplate. Make sure both folded-over ends are pressed well against the power terminals, even if they don't necessarily adhere.