Chemical System: Silver Oxide (Zn/Ag2O) Nominal Voltage: 1.55 Volts Typical Capacity: 15 mAh* (to 1.2 volts) Capacity Test: 68K ohm continuous drain at 21°C Typical Weight: 0.27 grams (0.009 oz.) Typical Volume: 0.07 cubic centimeters (0.004 cubic inch) Impedance (40 Hz): 35 to 45 ohms