EXELL S400PX The S400PX is a coin type cell that meets your standard of a battery for vintage cameras. Because the S400PX silver oxide cell produces a steady 1.55 Volts, you are able to use your camera to its fullest potential. There may be other batteries for vintage cameras, but you would be doing yourself a disservice by not getting the S400PX. It is also one of the few product lines proudly assembled in the U.S.A. Exell Batteries will last longer and offer consumers excellent reliability. Features: • Type: Silver Oxide • Voltage: 1.55V • Diameter: 11.6 mm (9.6mm without collar) • Height: 3.6 mm • Box of 6 Replaces: PX400 / EPX400 / RM400 / H-B / V400PX / E400N / PM400R / KX400 / T400N / 387 Compatible: Vintage camera equipment and sophisticated medical testing equipment.