New battery replaced, and maintenance completed. Tested and working on a NEW 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 starts almost immediately on our console, but we cannot guarantee immediate startup on clone consoles or other systems. This is an old product from several decades ago, so it may require a few insertions and removals.