New battery replaced, and maintenance completed. Tested and confirmed to boot and function on a Super Famicom. Disinfected with anhydrous ethanol. Please assess the condition of the cartridge based on 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 on my console, but there is no guarantee of immediate booting on other consoles. This is an old product from several decades ago, so it may require multiple insertions and removals.