page_title: Button cell
section_title: Package size
hierarchical_section_title: Button cell / Type designation / Package size
caption_attribution_description: English: I scanned them off in my scanner after buying them at my local shop. The sizes are written as a note at the bottom of the page and are stamped on the cells by the retailers/ manufacturers. The companies who made them are identified as near by headings and stamped on the cells like wise. They are all button cells, save for 4 9V batteries I added for a size comparison. It is now completed and cleaned up!-- --Wipsenade (talk) 17:45, 6 November 2010 (UTC) This work includes material that may be protected as a trademark in some jurisdictions. If you want to use it, you have to ensure that you have the legal right to do so and that you do not infringe any trademark rights. See our general disclaimer.This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
context_page_description: A watch battery or button cell is a small single cell battery shaped as a squat cylinder typically 5 to 25 mm in diameter and 1 to 6 mm high — resembling a button. A metal can forms the bottom body and positive terminal of the cell. An insulated top cap is the negative terminal.
  Button cells are used to power small portable electronics devices such as wrist watches, and pocket calculators. Wider variants are usually called coin cells. Devices using button cells are usually designed around a cell giving a long service life, typically well over a year in continuous use in a wristwatch. Most button cells have low self-discharge and hold their charge for a long time if not used. Relatively high-power devices such as hearing aids may use a zinc–air battery which have much higher capacity for a given size, but dry out after a few weeks even if not used.
  Button cells are single cells, usually disposable primary cells. Common anode materials are zinc or lithium. Common cathode materials are manganese dioxide, silver oxide, carbon monofluoride, cupric oxide or oxygen from the air.
context_section_description: Package size of button batteries using standard names is indicated by a 2-digit code representing a standard case size, or a 3- or 4-digit code representing the cell diameter and height.  The first one or two digits encode the outer diameter of the battery in whole millimeters, rounded down; exact diameters are specified by the standard, and there is no ambiguity; e.g., any cell with an initial 9 is 9.5 mm in diameter, no other value between 9.0 and 9.9 is used. The last two digits are the overall height in tenths of a millimeter.
  Examples:
  CR2032: lithium, 20 mm diameter, 3.2 mm height
  CR2025: lithium, 20 mm diameter, 2.5 mm height
  SR516: silver, 5.8 mm diameter, 1.6 mm height
  LR1154/SR1154: alkaline/silver, 11.6 mm diameter, 5.4 mm height. The two-digit codes LR44/SR44 are often used for this size
  Some coin cells, particularly lithium, are made with solder tabs for permanent installation, such as to  power memory for configuration information of a device. The complete nomenclature will have prefixes and suffixes to indicate special terminal arrangements.  For example, there is a plug-in and a solder-in CR2032, a plug-in and three solder-in BR2330s in addition to CR2330s, and many rechargeables in 2032, 2330, and other sizes.
caption: Several sizes of button and coin cell with four 9 V batteries as a size comparison
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