On the back to the right of the eyepiece, you will see a small plastic inset "door" that can be depressed and then slid out. DON"T LOOSE THIS!!!! Inside are 2 batteries that are rather hard to get out, but they do come out. They can be ordered via Radio Shack but are quite expensive.
The batteries pop in and the little door can be inserted and closed over them. Then the shutter is "electronic", but the shutter operates just fine without batteries by using the manual cock and fire levers.
I have one in the OB with the instruction manual.
PE