D7100 always on?
On most modern computer controlled devices, ie phones, computers, camera, etc, OFF is not really OFF. The internal clock is still running and a lot more on your phone and computer.
Besides the shots left, it is also remembering your last settings and time.
|Sadiqur_Rahman by Sadiqur Rahman|
from Ain't Going to Work on Maggie's Farm no More
|Airborne by John Beavin|
from - How to respect the Flag and Anthem - (Portrait in Full Colours + A Border)