And, if you don't use it for a long period of time, charge it every month to maintain battery life
What exactly happens when you "calibrate"?
What happens if you don't do it?
Is there any way to quickly discharge the battery rather than just using the iPT until it runs down? I'd like to be able to discharge it when I want to and it's convenient to recharge as opposed to using the device and having it run down, say, in the middle of the day when I want to be using it.