I have a D80. I don't know the average pictures this battery can take but it seems like it runs out quick compare to my D40. I got about 250 pictures and its a little more than halfway drain. This is a brand new battery that came with the camera also. I don't know did I got a defected one or thats how it is. But my main question is can I buy a battery off eBay and use it for my D80? Not made by Nikon. has anyone tried these? If the battery is overcharge and the voltage is higher then the Nikon battery will it ruin my camera? Thanks in advance.