New battery replaced. Maintenance completed. Startup and operation verified on Super Famicom. Disinfected with anhydrous ethanol. Please assess the condition of the cartridge based on 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. Maintenance has been performed to the point where it starts almost instantly on my console, but there is no guarantee of instant startup on other consoles. This is an old product from several decades ago, so it may require a few insertions and removals to work.