New battery replaced. Maintenance completed. Boot-up and operation confirmed 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 cleaned and polished with anhydrous ethanol and polishing compound to remove dirt. Maintenance has been performed to the point where it almost always boots up on my console, but there is no guarantee it will boot up on other consoles on the first try. This is an old product from decades ago, so it may require multiple insertions.