The Energizer CR1620 Lithium coin cell is often referred to as a watch battery but can also be found in a number of other small devices such as car alarm keyfobs, PDA organisers & calculators. Chemical System: Lithium / Manganese Dioxide (Li/ Mn O2) Nominal Voltage: 3.0 Volts Typical Capacity: 79 m Ah Typical Weight: 1.3 grams Dimensions: 16x 2mm Weight (g) 0.7 Pack Size 1 Also known as: DL1620, ECR1620, BR1620, 280-208, DL1620B, BR1620-1W, CR1620-1W, KCR1620, LM1620, 5009LC, L08, EA