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Size and Weight
The CR2032 has an outer diameter of 20 mm, an inner anode contact diameter of 17.7 mm and a height of 3.2 mm. Its specification allows for no more than .2 mm of deflection from completely flat over the surface of the battery. A typical CR2032 has a volume of one cubic centimeter and a weight of three grams.
Electrical Specifications
The battery has a nominal voltage of 3.0 volts and an electrical storage capacity of 240 milliamp-hours into a 15,000-ohm load. Simulated application tests of the CR2032 with a 68,000-ohm load and .043 milliamps of current give it a useful life of 721 hours. The battery̵7;s life ends when its voltage decreases to 2.0 volts. It has a typical internal resistance of 10,000 to 40,000 milliohms.
Chemical System
Button cell batteries with the ̶0;C̶1; designation, such as the CR2032, use a lithium negative electrode and a manganese dioxide anode. Unlike lithium-ion batteries, the CR2032 is not rechargeable; you discard it when it runs out of power. One CR2032 typically contains .109 grams of lithium and has an energy density of 198 milliwatt-hours per gram or 653 milliwatt-hours per cubic centimeter.
Use
Low-power electronic devices such as calculators, wristwatches, car remote door openers and stopwatches use the CR2032 battery. Its small size, light weight and good power density make it ideal for small handheld electronics with CMOS circuits and liquid crystal displays. These devices need a reliable voltage source and draw very little current. Items such as hearing aids typically use smaller-diameter ̶0;P̶1;-type button cell batteries; the CR2032 is too big for these applications.