New battery replaced. Maintenance completed. Startup and operation confirmed on a Super Famicom. Disinfected with anhydrous ethanol. Please assess the condition of the cartridge from the images. Only purchase if you are satisfied. The cartridge contacts have been cleaned and polished with anhydrous ethanol and polishing compound to remove dirt. They have been maintained to a condition where they start almost instantly on my system, but there is no guarantee of instant startup on other systems. Since this is an old product from decades ago, it may require a few insertions and removals to start.