CR2032 lithium coin cell battery
The CR2032 is a non-rechargeable lithium coin cell battery that delivers 3 V power in a compact 20 mm × 3.2 mm form. It is one of the world’s most widely used primary cells, valued for its long shelf life, stable voltage, and reliable performance in compact electronic devices such as watches, key fobs, and medical instruments.
Key facts
Nominal voltage: 3 V
Typical capacity: 210–240 mAh
Chemistry: Lithium manganese dioxide (Li-MnO₂)
Dimensions: 20 mm diameter × 3.2 mm thickness
Operating temperature: −30 °C to +60 °C
 
Design and composition
The cell’s identifier “CR2032” indicates its lithium chemistry (“C”), round shape (“R”), 20 mm diameter, and 3.2 mm height. Inside, a manganese-dioxide cathode and a lithium-metal anode generate a steady 3 V output through a separator soaked in organic electrolyte. This chemistry yields high energy density and low self-discharge—typically under 1 % per year—making the battery ideal for intermittent or low-drain use.
 
Performance characteristics
CR2032 cells maintain stable voltage until near depletion and can operate in sub-zero and high-temperature environments. Depending on manufacturer, nominal capacity ranges from 200 to 240 mAh with continuous discharge currents of 0.1–3 mA. The cell typically weighs about 3 g and provides dependable output for 3–5 years in key fobs or up to a decade in standby memory backup.
 
Common applications
CR2032 batteries power low-current or memory-retention electronics, including:
wristwatches, calculators, and small medical monitors
computer CMOS/RTC memory backup
remote controls and automotive keyless-entry fobs
 
Equivalents and safety
Equivalent model numbers include DL2032, BR2032, ECR2032, and 5004LC. Standard CR2032 cells are not rechargeable; attempting to recharge may cause leakage or rupture. Spent cells should be recycled through approved battery-collection programs.