New battery replaced. Maintenance completed. Startup and operation verified on a Super Famicom. Disinfected with anhydrous ethanol. Please judge the condition of the cartridge from the images. Please purchase only if you are satisfied. The cartridge contacts have been polished and cleaned using anhydrous ethanol and polishing compound to remove dirt. While this unit starts almost immediately on my system, I cannot guarantee immediate startup on other systems. Since this is an old product from decades ago, it may require a few insertions and removals to work.