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.
|Red umbrella by Jose Olivares|
from Black + White +1
|Scary Santa by Phillipvz|
from annual bad Santa photo challenge
|Honey, I'm Home!! by cbg1951|
from A Big Year - birds
|Lake freezes by Kaappo|
from -The Frozen Lake- ( In Full Colours Only)