Hong Kong SAR CR245 Lithium/Manganese Dioxide Button-cell Battery w/ 3V Nominal Voltage, for Home Security System on Global Sources,Button-cell Battery
CR1220 12mm Diameter - 3V Lithium Coin Cell Battery [CR1220] : ID 380 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Overview | Low Power Coin Cell Voltage Logger | Adafruit Learning System