* Aux PWR is a 5v power line that is fed from the host computer. It is supplied as a convenience to allow you to provide power to other devices. Do not attempt to use it as a power input.
* Aux Batt is an alternative battery connector, to be used if you do not want to use the built in CR2032 button cell. If you use Aux Batt, you *must* remove the button cell first, and the voltage you need to apply is 3v - 5v. Any more and The clock chip can tolerate up to 7v but it is not advisable to go this high as you risk damaging the clock chipit.
For both connectors, observe the connection polarity printed on the PCB.