Has anyone experienced this problem? After getting my D300 back from Nikon for a B2 repair, I was using it out in Bishop, CA. It worked perfectly for several days then inexplicably when I pulled it out to use it, it wouldn't fire. Upon examination there was a dead battery symbol showing though both the enel-4 in the battery grip and the enel-3e in the camera were both completely fresh (this symbol showed whether the camera was turned on or not and there were no other symbols on the top lcd whether it was on or off). I pulled the also fresh enel-4 out of my D3s and swapped batteries. No change but the battery from the D300 showed full in the D3s. I removed the lens and reattached it, no change.
I put the D300 away and grabbed my D2h. Upon returning to the motel I removed the L-bracket and grip and removed both batteries. I waited a little while and reinstalled them. Presto, no more dead battery warning. The problem has not reoccurred.
I took the camera back to Nikon but since the problem is not there now, I doubt they will do anything.
I once in a while experience this with the AA's in the grip. I turn off the camera, open the battery door just a bit and close it and all it good. I tried to clean the contacts and it does seem to help but it happens so little I don't worry about it as the camera has never stopped working because of it. I just hit 111000.00 clicks the other day. ; )
Thanks so much for sharing your experience in this matter. When it happened to me, removing the grip battery and replacing it didn't help. It was only by removing both batteries that the problem was rectified.
Just to report back in on the outcome of the latest trip to Nikon for my D300. They had to replace a battery contact due to a failed solder joint. So not a firmware issue nor a sporadic problem I would just have to put up with.
Hopefully I will not be experiencing this particular problem again. I like my D300 but am anxiously awaiting the D400 if it has improved high ISO capabilities. Wouldn't mind 16MP either.