This was a backup camera and didn’t get used as much as it should but was always taken on a shoot. The 100-300 lens will need a clean. Both lenses function and the camera cycles through the programmes as it should however the LCD screen bottom corners have darkened. The battery cartridges is for the 4 x AAA there was a minor battery leak on the cells years ago as there is no on off switch with this model. Hasn’t affected the camera however as I took one of the batteries out the spring came off the cradle. As such the camera is being sold as NOT WORKING. Spring can be soldered back on or a replacement cartridge purchased. Alternatively you can upgrade to a 6V carriage. All in all a great camera and well ahead of its time when purchased around 1985. Any questions please ask.