Hello, I have a relative with a Minolta Dynax 404si 35mm SLR film camera (circa mid-to-late 1990s), along with a couple of lenses. He wants to sell it, but with this caveat: the batteries (even when new) only last, at best, 6 months in the camera - that's when the camera is switched off. After about five or six months of storage, there's not even enough power left for the LCD to display anything but a dead battery icon. He thinks something might be wrong with it. Can anyone share their experiences?