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No, a lens is not required for the camera to operate. My 1st guess is that the AAA battery holder has some corrosion. The section that pivots has contacts the meet up to the flat section. I have removed the holder section from the pins to get at those contacts. A pencil eraser is a good cleaning tool. Be gentle removing it, the pins are plastic
The lithium button cell is under the metal plate where the battery holder attaches. There are six screws holding the plate to the camera. I believe the cell is a CR-2025.
That being said, replacing the lithium battery will only restore the cameras ability to remember your settings and frame counter when the regular batteries are not on the camera. It will not restore functions of the camera.
If the camera is not functioning properly, you have a power problem with the main batteries, not the memory backup cell