How does "mid charging" work? I understand that you get paid $800 or so, but only get to pocket $100 and the rest is used as held pay and some of the held pay can be used to mid charge. What I am confused about is how much of that held pay you will actually get. Do you get the same amount if you mid charge $0 or $500? Are you allotted so much per month and once that month has passed, the held pay is gone? Thanks.