A:AnswerYes, you can do so but we don't recommend leaving the headset or charging case connected to the charger for an extended time period since this might damage the battery in the long run.
A:AnswerThere is no on/off switch so that it can only be used solely as a case.
I suppose, you can drain the battery and use it as a case-only. Not sure why you would do that. There is a button you can press to determine the amount of charge left in the case battery.
A:AnswerThey don't pair.
Make sure you do not have the case for the Legend, they look the same but are not.
The 5200/5220 and legend have different shapes so they do not charge in the wrong case.
A:AnswerI called Plantronics to ask if a charging case that I had would work with the Voyager 5200 headset and they said that although they looked the same the case would not work. I am guessing that this case only works with the 5200 series headsets.