New battery replaced. Maintenance completed. Startup and operation confirmed on a Super Famicom. Disinfected with anhydrous ethanol. Please assess the condition of the cassette from the images. Please purchase only if you are satisfied. The cassette contacts have been polished and cleaned using anhydrous ethanol and a polishing compound to remove dirt. They have been maintained to a state where they almost always start up on my console, but there is no guarantee that they will start up immediately on other consoles. This is an old product from decades ago, so it may require a few insertions and removals.