Button cell

coin cellLR44CR2032watch batterybutton batteriesbutton batterybatterybutton cellscoin battery2032
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 — like a button on a garment, hence the name.wikipedia
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Mercury battery

mercury batteriesMercury cellMercuric oxide
Mercuric oxide button cells were formerly common, but are no longer available due to the toxicity and environmental effects of mercury.
Mercury batteries were used in the shape of button cells for watches, hearing aids, cameras and calculators, and in larger forms for other applications.

Silver-oxide battery

silver-zinc batteriessilver-zinc batterysilver-zinc
Silver cells may have very stable output voltage until it suddenly drops very rapidly at end of life.
Available either in small sizes as button cells, where the amount of silver used is minimal and not a significant contributor to the product cost, or in large custom-designed batteries, where the superior performance of the silver-oxide chemistry outweighs cost considerations.

Zinc–air battery

zinc-air batterieszinc-air batteryZinc–air
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 over a few weeks even if not used.
Sizes range from very small button cells for hearing aids, larger batteries used in film cameras that previously used mercury batteries, to very large batteries used for electric vehicle propulsion.

Electric battery

batterybatteriesbattery-powered
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 — like a button on a garment, hence the name.
Primary batteries readily available to consumers range from tiny button cells used for electric watches, to the No. 6 cell used for signal circuits or other long duration applications.

Quartz clock

quartz watchquartzquartz movement
L, S, and C type cells are today the most commonly used types in quartz watches, calculators, small PDA devices, computer clocks, and blinky lights.
The 32768 Hz resonator has become so common due to a compromise between the large physical size of low-frequency crystals for watches and the large current drain of high-frequency crystals, which reduces the life of the watch battery.

Artificial cardiac pacemaker

pacemakerpacemakersartificial pacemaker
Button cells are used to power small portable electronics devices such as wrist watches, pocket calculators, artificial cardiac pacemakers, implantable cardiac defibrillators, automobile keyless entry transmitters, and hearing aids.
Button cell

Watch

wristwatchwatchesdigital watch
Button cells are used to power small portable electronics devices such as wrist watches, pocket calculators, artificial cardiac pacemakers, implantable cardiac defibrillators, automobile keyless entry transmitters, and hearing aids.
For quartz wristwatches, subsidiaries of Swatch manufacture watch batteries (Renata), oscillators (Oscilloquartz, now Micro Crystal AG) and integrated circuits (Ebauches Electronic SA, renamed EM Microelectronic-Marin).

Flashlight

torchpenlighttorches
Small LED flashlights
"Keychain" type lamps operating on button batteries, or lights using a single 5 mm LED, may only produce a couple of lumens.

Rechargeable battery

rechargeablerechargeable batteriesstorage batteries
In addition to disposable (single use) button cells, rechargeable batteries in many of the same sizes are available, with lower capacity than disposable cells.
Rechargeable batteries are produced in many different shapes and sizes, ranging from button cells to megawatt systems connected to stabilize an electrical distribution network.

Nonvolatile BIOS memory

CMOSNVRAMbattery backed RAM
Backup power for personal computer BIOS configuration data
The memory battery (aka motherboard, CMOS, real-time clock (RTC), clock battery) is generally a CR2032 lithium coin cell.

Lithium battery

lithium batterieslithiumlithium cell
Button cell batteries are attractive to small children and often ingested.

List of battery sizes

AA batteries217002CR5
List of battery sizes
Manufacturers may assign proprietary names and numbers to their batteries, disregarding common, colloquial, IEC, and ANSI naming conventions (see LR44 battery as an example).

Sodium hydroxide

caustic sodaNaOHsodium
S: sodium hydroxide electrolyte
Lithium battery cells, if ingested, cause serious injuries, even if not crushed.

Battery recycling

recyclingrecyclerecycled
Battery recycling
However, some batteries are recycled more readily than others, such as lead–acid automotive batteries (nearly 90% are recycled) and button cells (because of the value and toxicity of their chemicals).

LED art

throwiesblinkiesblinky lights
L, S, and C type cells are today the most commonly used types in quartz watches, calculators, small PDA devices, computer clocks, and blinky lights.
An LED throwie is a small LED attached to a coin battery and a rare earth magnet (usually with conductive epoxy or electrical tape), used for the purpose of creating non-destructive graffiti and light displays.

Hearing aid

hearing aidshearing instrumentshearing technology
Button cells are used to power small portable electronics devices such as wrist watches, pocket calculators, artificial cardiac pacemakers, implantable cardiac defibrillators, automobile keyless entry transmitters, and hearing aids.
While there are some instances that a hearing aid uses a rechargeable battery or a long-life disposable battery, the majority of modern hearing aids use one of five standard button cell zinc–air batteries.

Sucralfate

While the only cure for an esophageal impaction is endoscopic removal, a recent study out of Children's Hospital of Philadelphia by Rachel R. Anfang and colleagues found that early and frequent ingestion of honey or sucralfate suspension prior to removal can reduce the injury severity to a significant degree.
Sucralfate suspension is recommended by the US-based National Capital Poison Center (Poison Control) as an intervention for known or suspected button battery ingestions to reduce the risk and severity of injury to the esophagus prior to the battery's endoscopic removal.

Honey

bee honeyforest honeyhonied
While the only cure for an esophageal impaction is endoscopic removal, a recent study out of Children's Hospital of Philadelphia by Rachel R. Anfang and colleagues found that early and frequent ingestion of honey or sucralfate suspension prior to removal can reduce the injury severity to a significant degree.
The use of honey has been recommended as a temporary intervention for known or suspected button cell ingestions to reduce the risk and severity of injury to the esophagus caused by the battery prior to its removal.

Implantable cardioverter-defibrillator

implantable cardioverter defibrillatorimplantable cardiac defibrillatorICD
Button cells are used to power small portable electronics devices such as wrist watches, pocket calculators, artificial cardiac pacemakers, implantable cardiac defibrillators, automobile keyless entry transmitters, and hearing aids.
Button cell

Cylinder

cylindricalcylindersrod
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 — like a button on a garment, hence the name.

Button

buttonsbutton-upcloth buttons
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 — like a button on a garment, hence the name.

Terminal (electronics)

terminalterminalstwo-terminal
A metal can forms the bottom body and positive terminal of the cell.

Mobile computing

mobilemobile computermobile computers
Button cells are used to power small portable electronics devices such as wrist watches, pocket calculators, artificial cardiac pacemakers, implantable cardiac defibrillators, automobile keyless entry transmitters, and hearing aids.

Primary cell

primary batteryprimaryprimary batteries
Button cells are single cells, usually disposable primary cells.