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I have 2 D-40's and I am getting about 5 weeks out of the batteries and about 800 photos.Just an FYI.
I use CHEAP batteries. I pay $1.00 for 2. They last just as long as the expensive duracells. I was surprised to find that. I found them in a local grocery store and figured might as well try them. I figured I could just replace them more often but was surprised to find they last just as long.
Some of the cameras have a solar panel that you can hook right to the camera, my little brother has one, they seem to work very well. We have gone months and filled up a 2gig SD card. With that system battery life is never and issue.
murphyranch what voltage is the charger you found? I have thought of doing the same but didn't know what voltage would work on the d-40. Great idea. I have seen some go really cheap on ebay.Kris