Button cell

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Type CR2032 watch battery (lithium anode, 3V, 20.0mm 3.2mm)
A watch battery, button cell, silver button cell, or coin cell is a small form-factor battery designed for use in wrist watches, pocket calculators, hearing aids, and similar compact portable electronics products. They are compact and have long life. They are usually a single cell with a nominal voltage between 1.5 and 3 V. Common anode materials are zinc or lithium; common cathode materials are manganese dioxide, silver oxide, carbon monofluoride, cupric oxide or mercuric oxide. The cylindrical sides of these types of batteries is part of the positive (+) terminal.
Contents
1 Type designation
1.1 Electrochemical system
1.2 Package size
1.3 Final letters
2 Other package markings
3 Common applications
4 Rechargeable variants
5 Other chemical compositions
6 See also
7 References
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Type designation
International standard IEC 60086-3 defines an alphanumeric coding system for watch batteries.
Electrochemical system
The first letter identifies the electrochemical system used in the battery, which also implies a nominal voltage:
Lettercode
Positive electrode
Electrolyte
Negative electrode
Nominalvoltage
End-pointvoltage
L
Manganese dioxide
Alkali
Zinc
1.5
1.0
S
Silver oxide
Alkali
Zinc
1.55
1.2
P
Oxygen
Alkali
Zinc
1.65
1.4
C
Manganese dioxide
Organic
Lithium
3
2.0
B
Carbon monofluoride
Organic
Lithium
3
2.0
G
Copper oxide
Organic
Lithium
1.5
1.2
The "C"-type 3-V lithium cells are today the most commonly-used type in quartz watches, calculators, small PDA devices, and computer motherboard clocks.
Package size

4.5-Volt, D, C, AA, AAA, 9-Volt, SR41/AG3, SR44/AG13 cells
Its package's size is identified by a three-to-four digit code, preceded by the letter "R" to indicate a round cell. The first 12 digits indicate the outer breadth of the battery (in millimeters, rounded down), and the last two digits indicate the overall height (in tenths of millimeters, rounded down). Examples:
CR2032: 20 mm diameter, 3.2 mm height
SR516: 5.8 mm diameter, 1.6 mm height
ISO/IEC 83-3 lists the following diameter codes:
4 = 4.8+0?0.15mm
5 = 5.8+0?0.15mm
6 = 6.8+0?0.15mm
7 = 7.9+0?0.15mm
9 = 9.5+0?0.15mm
10 = 10.0+0?0.20mm
11 = 11.6+0?0.20mm
12 = 12.5+0?0.25mm
16 = 16+0?0.25mm
20 = 20+0?0.25mm
23 = 23+0?0.50mm
24 = 24.5+0?0.50mm
The following height codes are used with 1624 mm diameter batteries:
12 = 1.20+0?0.20mm
16 = 1.60+0?0.20mm
20 = 2.00+0?0.25mm
25 = 2.50+0?0.50mm
30 = 3.00+0?0.50mm
36 = 3.60+0?0.50mm
50 = 5.00+0?0.50mm
Final letters
After the package code, the following additional letters may optionally appear in the type designation to indicate the electrolyte used:
S: sodium hydroxide electrolyte
P: potassium hydroxide electrolyte
no letter: organic electrolyte
An appended letter "W" states that this battery complies with all the requirements of the IEC 86-3 standard for watch batteries.
Other package markings
Apart from the type code described in the preceding section, watch batteries should also be marked with
the name or trademark of the manufacturer or supplier;
the polarity (+);
the date of manufacturing.
The manufacturing date can be abbreviated to the last digit of the year, followed a digit or letter indicating the month, where O, Y, and Z are used for October, November and December, respectively (e.g., 01 = January 1990 or January 2000, 9Y = November 1999).
Common applications
Quartz wristwatches, both digital and analog.
Calculators
Hearing aids
Some remote controls, especially for keyless entry
Backup power for personal computer real time clocks and BIOS configuration data.
Small PDA devices
Various electronic toys (tamagotchi)
Laser pointers
Small LED flashlights are commonly powered by three button (silver-oxide) cells in series.
Battery-operated children's books
Glucometers
Security tokens
Cyclocomputers
Red dot sights and electronic spotting scopes
Manual cameras with light meters, such as the Pentax K1000
Rechargeable variants
Regular watch batteries are not rechargeable. Rechargeable button cells are commercially available,...(and so on) To get More information , you can visit some products about 1.5v watch batteries, Radio Clock Battery, . The Replace for Laptop Battery Toshiba PA3331U-1BAS products should be show more here!