Quick Charge OBXU - Manual (Page 7)

REPROGRAMMING:
Disconnect the charger from the batteries, and unplug the power
cord. Remove the four bolts holding the covers on. Open the side
with the LED and remove paper insulator.
Select the switch configuration that most closely matches your
application. Whether choosing maintenance mode, or shut off is a
personal preference, however the maintenance mode assures
batteries will remain charged and won’t self discharge.
IMPORTANT: Use switch numbers as a guide, as some boards
may be upside down, and reversed.
Replace paper insulator and reassemble, making sure not to pinch
any wires in the covers.