If you ever need to power down the Hub for any reason just follow these steps:
Make sure the Hub is currently disarmed (LED should be Green)
Unplug the Hub’s AC power
Open the battery compartment on the underside of the Hub and flip the small, black switch next to the battery to the OFF position.
Whenever you are ready to turn the Hub back on, simply follow these same steps in reverse and allow it 1-2 minutes to fully boot up.