New battery replaced, and maintenance completed. Tested and working on a Famicom. Disinfected with anhydrous ethanol. Please assess the condition of the cartridge based on the images. Only purchase if you are satisfied. The cartridge pins 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 starts on the first try on my console, but there is no guarantee of first-try startup on other consoles. This is an old product from several decades ago, so it may require multiple insertions and removals.