Characteristic’s like, dependable power with long-lasting durability has made Energizer® 1220 Battery a universal lithium coin battery that powers a wide range of gadgets in your life with a flow of charge you can count on specifically car security (car alarm/key fob batteries), organizer (backup battery for PDA such as Psion), glucometer, electric thermometer, calculator, computer equipment (memory backup battery), toys, communication equipment, electronic watches/clocks, card radios, data pack for video camera. Energizer CR1220 batteries are providing shelf life of 10 + years, so why not buy extras? So, grab the opportunity of our reduced price and make sure your wrist does not miss your favorite watch next time your battery runs out. Associated Battery Size: 1220, 5012LC, AWI L04, BR1220, CR1220, DL1220, ECR1220, KCR1220, LM1220, Seiko SB-T13, Timex PA • Specifications  Classification: "Lithium Coin"  Chemical System: Lithium / Manganese Dioxide (Li/MnO2)  Designation: ANSI-5012LC, IEC-CR1220  Nominal Voltage: 3.0 Volts  Typical Capacity: 45 mAh (to 2.0 volts) (Rated at 62K ohms at 21°C)  Typical Weight: 0.78 grams (0.03 oz.)  Typical Volume: 0.25 cubic centimeters (0.02 cubic inch)  Max Rev Charge: 1 microampere  Energy Density: 153 milliwatt hr/g, 464 milliwatt hr/cc  Typical Li Content: 0.006 grams (0.0002 oz.)  Operating Temp: -30C to 70C  Self-Discharge: ~1% / year