The controller normally runs on 3 AA batteries (4.5V). As the batteries discharge, the voltage supplied gradually decreases. In fact, it will even continue to operate with just a jumper wire and 2 AA batteries (3V).
The KB2040's 3.3V regulator not only supplies adequate power, but also ensures the controller's button output signals remain within a safe operating range for the KB2040's GPIO to read
Since the existing batteries are no longer needed, begin by carefully trimming the power wires as close to the back shell as possible.
You'll be reusing this cable assembly, so hold onto it.
Next, ensure the black and red wires are of equal lengths, and carefully remove a small portion of insulation from their ends.
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