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Small battery
Button, coin, or watch cells
A button cell, watch battery, or coin battery is a small single-cell battery shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button. Stainless steel usually forms the bottom body and positive terminal of the cell; insulated from it, the metallic top cap forms the negative terminal.
Button cell use in RTC modules as power source
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, holding their charge for a long time if not used. Relatively high-power devices such as hearing aids may use a zinc–air battery, which has a much higher capacity for a given size, but dries out after a few weeks even if not used.[citation needed]
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.[citation needed] Mercuric oxide button cells were formerly common, but are no longer available due to the toxicity and environmental effects of mercury.
Button cells are dangerous for small children, as when swallowed they can cause severe internal burns and significant injury or death.[1] Duracell has attempted to mitigate this by adding a bitter coating to their batteries.[2]
^"See what a button battery can do to a child's throat". BBC News Online. 22 September 2016. Archived from the original on 22 September 2016.
^"Duracell Is Making Coin Batteries Taste Horrible on Purpose". PCMAG. Retrieved 2022-02-17.
A buttoncell, watch battery, or coin battery is a small single-cell battery shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter...
zinc-air batteries are buttoncells that use oxygen in air as a reactant and have very high capacity for their size. Each cell needs around 1 cm3 of air...
Battery room Battery-storage power station Biobattery Buttoncell CMOS battery Common battery Commodity cell Electric-vehicle battery Flow battery Home energy...
mercuric oxide battery, mercury cell, buttoncell, or Ruben-Mallory) is a non-rechargeable electrochemical battery, a primary cell. Mercury batteries use a reaction...
from tiny buttoncells used for electric watches, to the No. 6 cell used for signal circuits or other long duration applications. Secondary cells are made...
requires an Apple ID and iOS or iPadOS 14.5 or later. It uses the CR2032 buttoncell, replaceable with one year of battery life (though batteries with child-resistant...
used non-buttoncell batteries, such as the cylindrical "1/2 AA" used in the Power Mac G4 as well as some older IBM PC compatibles, or a 3-cell nickel–cadmium...
lithium-ion battery. Three volt lithium primary cells such as the CR123A type and three volt buttoncells are still widely used, especially in cameras and...
batteries, solar cells or mains electricity (for old models), turning on with a switch or button. Some models even have no turn-off button but they provide...
discharge until fully depleted. They are available in small sizes as buttoncells, where the amount of silver used is minimal and not a prohibitively expensive...
activities (excluding buttoncells) were sold to Rayovac. The automotive battery business was acquired by Johnson Controls. The buttoncell and home energy...
such as lead–acid automotive batteries (nearly 90% are recycled) and buttoncells (because of the value and toxicity of their chemicals). Rechargeable...
batteries are produced in many different shapes and sizes, ranging from buttoncells to megawatt systems connected to stabilize an electrical distribution...
Each game cartridge included an LCD. The system used one to two LR44 buttoncell batteries depending on the model. "Bandai Digi Casse - Game Console -...
location of the SmartTag to the owner. The device also has a programmable button that can be used to control SmartThings-compatible smart-home products....
in button forms. Several individual cells may be interconnected to form a true "battery", such as the 9-volt PP3-size battery. A cylindrical cell is contained...
instead feature pin holes. Nine-volt batteries have snap-on connectors. Buttoncell (watch batteries) have terminals as both flat sides. "Evergreen (C.P...
have an internal backup battery in the form of an easily changed small buttoncell, which allows the main AA batteries to be changed while losing no data...
(MOS) integrated circuits allowed a 12-month battery life from a single coin cell when driving either a mechanical Lavet-type stepping motor, a smooth sweeping...
include: low power requirements, operating for "months or years" on a buttoncell. small size and low cost. compatibility with a large installed base of...
humans via consumption of undercooked eggs. Disk batteries, also called buttoncells, are often mistakenly ingested, particularly by children and the elderly...
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