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Lithium, silver oxide, and alkaline button and coin cell batteries are used to power small portable electronics devices such as watches, clocks, timers, pocket calculators, artificial cardiac pacemakers, implantable cardiac defibrillators, automobile key less entry transmitters, and laser pointers.
Lithium batteries (CR) cost more than alkaline, but last longer, weigh less, and can operate in a much wider temperature range. Lithium sizes can be determined from their reference numbers. The first two digits refer to the diameter of the battery in mm and the second two digits give the height or thickness of the battery in tenths of mm. So, for example, a CR2032 is a Lithium button cell which is 20 mm in diameter and 3.2 mm thick.
There are three main differences between Silver Oxide (SR) and Alkaline (LR) batteries. 1) Silver oxide batteries have a 50% - 100% greater capacity, meaning they last up to twice as long as alkaline batteries. 2) Silver oxide has a relatively slow declining voltage during discharge compared to alkaline, which is preferable for light meters used in cameras and digital calipers. 3) Silver oxide batteries have superior leakage resistance, meaning they're more corrosion resistant.
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