New battery replaced, and maintenance completed. Boot-up and operation confirmed on a Super Famicom. Disinfected with anhydrous ethanol. Please assess 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 of immediate boot-up on other consoles. This is an old product from several decades ago, so it may require multiple insertions and removals.