Button Cell Battery Size Converter
Cross-reference CR and LR button cell battery sizes, dimensions, voltages, and equivalent part numbers from Energizer, Duracell, and other brands.
Select a button cell battery — see dimensions, voltage, and equivalents.
Button cell batteries are identified by an international numbering system based on their chemistry and physical dimensions. Understanding this system lets you find exact replacements even when brand names differ.
Battery chemistry prefixes:
- CR = Lithium (3.0 V) — long shelf life, wide temperature range, most common for electronics
- LR = Alkaline (1.5 V) — lower cost, shorter life, common in toys and simple devices
- SR = Silver Oxide (1.55 V) — very stable voltage, preferred for watches and precision instruments
- BR = Lithium Carbon Monofluoride (3.0 V) — better high-temperature performance than CR
How the numbering system works: The digits after the prefix encode the battery dimensions. For four-digit numbers (e.g., CR2032): the first two digits are the diameter in millimeters (20 mm) and the last two digits are the thickness in tenths of a millimeter (3.2 mm). For three-digit numbers (e.g., CR927): the first digit is the diameter in mm (9 mm) and the last two digits are the thickness in tenths of a mm (2.7 mm).
Common equivalents across brands: Different manufacturers use their own part numbers for the same battery. For example, CR2032 is also sold as Energizer ECR2032, Duracell DL2032, Sony CR2032, and Panasonic CR2032. The IEC (International Electrotechnical Commission) designation is the universal standard that all brands map to.
Choosing the right replacement: Always match three things: diameter, thickness, and voltage. A CR2032 (lithium, 3V) and LR2032 (if it existed as alkaline) would be the same physical size but different voltage. Most devices are designed for a specific voltage, so switching chemistry types can cause malfunction. When in doubt, replace with the exact same type.
Capacity and shelf life: Lithium CR cells typically have a shelf life of 8 to 10 years and maintain stable voltage until near the end of life. Alkaline LR cells last about 3 to 5 years on the shelf and their voltage drops gradually during use. Silver oxide SR cells offer the flattest discharge curve, making them ideal for watches that need consistent timekeeping accuracy.
Storage tips: Store button cells at room temperature in their original packaging. Never store loose button cells together or with metal objects, as short circuits can cause overheating. Keep all button cells away from children, as ingestion is a serious medical emergency requiring immediate attention.