I had a situation here.
I had bought recently bought a DIGITA Nikon EN-EL14+ Replacement 7.4V "1030mAh" Fully Decoded Battery for Nikon D5100 - Black from DX.com
Had it charged and used twice and was working perfectly fine
However, just like last week I kept it inside my Dry Cabinet and took it out to use as spare.
It pop out a error " Battery Error " indicating that my battery is not compatible with the camera.
Question is : Does having the battery to be placed just like that inside the dry cabinet might have caused the sudden error ?