I suspect you were looking at my MintyBoost version that used the Lipo charger and the mini voltmeter. On the Adafruit LiPo USB charger, BATT+ and LOAD+ connections are tied together. To install the voltmeter I cut the BATT+ PCB trace and soldered the small switch into the GND connection on the PCB. This made a good mechanical connection for the switch. Since the switch takes up too much room to get at the BATT+ pad, the + side of the voltmeter was soldered into the LOAD+ connection. If I had to do it over again, I would solder in the voltmeter to the BATT pads on the PCB and simply put the switch on the battery itself to save the small drain from the MintyBoost resistor network.