Coin cell batteries, also known as button cells, are small, flat, and round batteries commonly used in a variety of small electronics.
Some of the most popular coin cell battery sizes include:
- CR2032: This is perhaps the most common size, featuring a 20mm diameter and 3.2mm thickness. It is a lithium-manganese dioxide battery.
- CR2025: Slightly thinner than the CR2032, this battery also has a 20mm diameter, but with a 2.5mm thickness.
- CR2016: This is another common size in the CR family, characterized by a 20mm diameter and 1.6mm thickness.
- LR44/AG13: This size has a diameter of 11.6mm and a height of 5.4mm. It is an alkaline battery.
- LR41/AG3: This smaller alkaline battery has a diameter of 7.9mm and a height of 3.6mm.
- SR626SW (377): This size is commonly used in watches and has a diameter of 6.8mm and a height of 2.6mm. It is a silver oxide battery.
The alphanumeric codes on coin cell batteries follow a general pattern:
- First letter (or two letters): This indicates the battery’s chemical composition. For example:
– CR: Lithium Manganese Dioxide
– LR: Alkaline Manganese Dioxide
– SR: Silver Oxide/Zinc
– ZA/PR: Zinc-Air
- Numbers: These indicate the battery’s physical dimensions.
– First two numbers: Diameter in millimeters (or just the first number for three-digit codes).
– Last two numbers: Thickness in tenths of a millimeter. For example, a “32” indicates 3.2mm thickness.
- Matching the Code: Always use the battery size recommended by the device manufacturer.
- Rechargeable vs. Disposable: Be aware that some coin cell sizes come in both disposable and rechargeable variants, and their prefixes will differ.
- Safety: Dispose of used batteries properly and keep them out of reach of children and pets, as they can be a choking hazard and cause internal burns if swallowed.
What size are coin batteries?
Alkaline coin cells all start with an “L”, while lithium coin cells are all prefixed with a “C”. The popular CR2032, for example, is a lithium battery (3V nominal voltage) measuring 20mm in diameter and 3.2mm tall. An LR1154 (aka LR44) is an alkaline battery (1.5V) measuring 11mm across and 5.4mm tall.
What are the sizes of batteries in order?
Types of Alkaline Batteries
In order of smallest to largest, they are A23, N, AAAA, AAA, AA, C, 9V, and D. View our graphic below for a quick identification and size comparison of each alkaline battery.
How do I know which coin battery I need?
Measure the old battery’s diameter and height, or consult the device’s manual to find out the recommended battery size. Ensure that the replacement battery matches these dimensions. Voltage is another critical specification. Most button batteries have a voltage range between 1.2V and 3V.