Description Chemistry: Alkaline (The “L” in LR721 indicates alkaline chemistry). A silver oxide version (SR721SW) is also available and generally offers a more stable voltage. Voltage: 1.5V (Alkaline) or 1.55V (Silver Oxide). Capacity: Approximately 18-21mAh. Dimensions: 7.9 mm (diameter) x 2.1 mm (height). Common Uses: Watches, small toys, remote keys, calculators, laser pointers, and various health and fitness devices.
