The case in the description does not happen with simple adapters, I
assume the user has some sort of intelligent charger that shuts off?
otherwise the phone would not detect being unplugged since it was not.

when the phone decides the battery is full, it stops drawing current. 
Correct

The battery then decides that charging is over and automatically switches off. 
Not sure what this means. The phone will still be active and will not suspend 
while something is plugged into the usb port. (which I is a different issue, we 
wish it would suspend and charge faster when its a charger and not a device 
thats connected)

The phone then decides that it's been unplugged and turns the screen on.
This does not happen on the standard adapters.

** Changed in: canonical-devices-system-image
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1512211

Title:
  Charging from USB battery, phone stops charging, switches on screen,
  and discharges

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