More common than you may think the 1/2 AA battery cell is also called is used in devices such as
Utility metering
Automatic meter reading
Alarms and security devices
Tollgate systems
Memory back-up
Computer real-time clocks
Tracking systems
Automotive electronics
Professional electronics
High voltage response
stable during most of the lifetime of the application
Wide operating temperature range(-60oC/+85oC)
Low self-discharge rate (less than 1% per year of storage at +20oC)
Easy integration into compact systems
Superior resistance to atmospheric corrosion
Diameter (max) 14.55 mm (0.57 in) Height (max)25.15 mm (0.99 in)
