Great for electronics around the house, like keyless entry, electronic books and glucose monitors. The CR2016 lithium button cells are commonly used in car security (car alarm/key fob batteries), organizer (backup battery for PDA such as Psion), glucometer, camera, electric thermometer, calculator, computer equipment (memory backup battery), toys, accutron, communication equipment, electronic watches/clocks, card radios, data pack for video camera. SpecificationsHigh, 3.0V energy densityStable discharge characteristics through low internal resistance and high operating voltage, leakage resistance and excellent storage characteristicsOptimum for memory and RTC backup displaysLong-term, stable operating voltage at low load dischargeVoltage: 3VCapacity: 90mAhDiameter: 20.0mmHeight: 1.2mm .