I have a Nikon D7000 and I also have Neewer battery grip. I had been using it with just one battery for a while and the indicator on the camera showed the correct state of battery charge whether the battery was in the camera or in the grip.
I now have 2 batteries, 1 in the camera and 1 in the grip, however the battery charge indicator on the camera still seems to show the state of only one battery as the charge has dropped as if I only have 1 battery in it.
I previously had the D200 with a battery grip and this worked fine. Anyone come across this issue before ?