@lemonpotty: With the check battery error popping up, the DNA200 can turn itself off. So I am not surprised it does with some key presses. Here are the Device Monitor readings with 3 of 5 of my VT133. I unplugged the USB each time for each battery removal and insertion. Otherwise I got different readings than the below.
HCigar VT133_02
Cell 1 Only = 0.00v (actual 4.00v)
Cell 2 Only = 2.86v (actual 4.00v)
No Cells = All read 0.00v
HCigar VT133_03
Cell 1 Only = 0.00v (actual 4.10v)
Cell 2 Only = 0.00v (actual 4.10v)
No Cells = All read 0.00v
HCigar VT133_04
Cell 1 Only = 0.00v (actual 3.92v)
Cell 2 Only = 3.31v (actual 3.92v)
No Cells = All read 0.00v
The above will always read cell 3 as 0.01v. My other two are early serial numbers and they will read cell 3 anywhere between 0.50v to 1.50v.
Added: This is 5 of 5
HCigar VT133_05
Cell 1 Only = 0.00v (actual 4.17v)
Cell 2 Only = 0.00v (actual 4.17v)
No Cells = All read 0.00v