I recently acquired a Canon QL17 GIII in fairly good shape. It seems to be completely functional mechanically. The battery contacts needed some cleaning so I went about it after opening the bottom plate of the camera. The cleaning went well and I saw the battery check light glow but the needle inside the viewfinder seems to indicate an aperture 5 stops larger for the ASA and shutter speed I set. I am gauging it against the sunny 16. I am using the hearing aid battery so the voltage is pretty close to ideal. Is it possible that the meter is functional but hugely offset? I haven't run a role through it with the meter yet. Should I?