Locate the soldering joint connecting the battery wires to the power supply, marked by the letters "PS" on the motherboard.

Hold the battery wires in place so that access to the soldering joints is not blocked.

When using a soldering iron, keep your hands and fingers as far as possible from the iron's tip to avoid burning your skin.

Using a soldering iron, melt the solder connecting the red wire to the motherboard. Do the same action to the black wire.