Adhere copper tape to battery terminals

Finally, grab your phone. To the left of the battery, you'll see two power terminals. Take the last two pieces of copper tape, and, repeating the method from the last step, fold over one end. Place the folded-over end in to the top terminal, and repeat the same thing with the bottom terminal.

With a pencil, push the folded-over ends copper tape into the terminals just a bit, so there's a good connection with the circuitry.