This is the original battery that has worked for months. it is all charged. Some times I can get the camera to work with it and sometimes I only get the "this battery cannot be used. Choose battery designated for use in this camera"
It is not the latest camera, so perhaps the battery too is not as fresh anymore. Still, when you really can charge it and you can use it for lots of pictures one time and the next time not, is a bit strange.
I would start with cleaning the contacts on the battery and in the camera. Never use anything sharp, or anything with force.
Best thing you can use is a piece of dry cloth or cotton swab. All contacts should be clean and shiny. NO oxidation is allowed, no dust in the battery holder.
If you have electronic contact cleaner O would try a but on the cloth, but less then a drop. and after that dry and dry it, because it could speed up oxidation in the long run. That is why I normally don't advice this.
Then Nikon has a policy, to check in camera if you are using a genuine battery. They must invest to make complete safe batteries, to protect the expensive camera's and dodgy manufactures make batteries, just to sell and don't care if you blow up the battery and camera. So special the modern camera's have detectors to check the battery. I'm not sure they did the same in any update for the D40.
When you don't use the camera for a long time, make it a habit to charge the battery every few months.
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