Measure the length of the cable from the JST ConnectOR to the USB port.
Cut the positive (Red) cable in half and solder to one of the pins on the slide switch. Remember to slide a small piece of heat shrink to seal the connections.
Shorten the battery cable by carefully cutting the wires and then heat shrinking each wire connection.
For a compact circuit we can reroute the power by soldering the JST Extension cable to the on-board battery connection.
Pop the slide switch through the cavity for a tight fit
Carefully position the battery on top of the circuit.