Nikon has initiated a voluntary recall of certain lot numbers of the EN-EL3 batteries that were not made in Japan.
Seems there is a possibility of a melt down with these batteries. 
Go to the Nikon USA 105mm Lens page and click on the EN-EL3 Battery Recall link for a list of the recalled lots and instructions on how to print return shipping labels etc.
This notice was posted on the Nikon USA site in Dec 2005. I was certainly unaware of it.
