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View source for Button cell - Wikipedia

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Your current IP address is 8.222.208.146. </p> <div class="paragraphbreak" style="margin-top:0.5em"></div><div style="font-size: 16px;"> <p>Even while globally blocked, you will <i>usually</i> still be able to edit pages on <a href="https://meta.wikimedia.org/wiki/" class="extiw" title="m:">Meta-Wiki</a>. </p> </div> <div class="paragraphbreak" style="margin-top:0.5em"></div><div style="font-size: 16px;"> <p>If you believe you were blocked by mistake, you can find additional information and instructions in the <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/No_open_proxies" class="extiw" title="m:Special:MyLanguage/No open proxies">No open proxies</a> global policy. Otherwise, to discuss the block please <a href="https://meta.wikimedia.org/wiki/Steward_requests/Global" class="extiw" title="m:Steward requests/Global">post a request for review on Meta-Wiki</a>. You could also send an email to the <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/Stewards" class="extiw" title="m:Special:MyLanguage/Stewards">stewards</a> <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/VRT" class="extiw" title="m:Special:MyLanguage/VRT">VRT</a> queue at <kbd>stewards@wikimedia.org</kbd> including all above details. </p> </div> <p>Other useful links: <a href="https://meta.wikimedia.org/wiki/Global_blocks" class="extiw" title="m:Global blocks">Global blocks</a> &#183; <a href="/wiki/Help:I_have_been_blocked" title="Help:I have been blocked">Help:I have been blocked</a> </p> </div></li></ul><hr /> <div id="viewsourcetext">You can view and copy the source of this page:</div><textarea readonly="" accesskey="," id="wpTextbox1" cols="80" rows="25" style="" class="mw-editfont-monospace" lang="en" dir="ltr" name="wpTextbox1">{{more citations needed|date=August 2023}} {{short description|Small battery}} [[File:Coin-cells.jpg|thumb|upright=1.35|Button, coin, or watch cells]] A '''button cell''', '''watch battery''', or '''coin battery''' is a small [[battery (electricity)|battery]] made of a single [[electrochemical cell]] and shaped as a squat [[cylinder]] typically {{convert|5|to|25|mm|in|3|abbr=on}} in [[diameter]] and {{convert|1|to|6|mm|in|3|abbr=on}} high – resembling a [[button]]. [[Stainless steel]] usually forms the bottom body and [[Electric charge|positive]] [[Terminal (electronics)|terminal]] of the cell; insulated from it, the metallic top cap forms the [[Electric charge|negative]] terminal. [[File:Types of RTC modules 2.jpg|thumb|upright=1.35|Button cell use in [[Real-time clock|RTC modules]] as power source]] Button cells are used to power small [[portable electronics]] devices such as [[wrist watch]]es and [[pocket calculator]]s. 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 [[Capacitance|capacity]] for a given size, but dries out after a few weeks even if not used.{{Citation needed|date=August 2023|reason=technical specifications are not common knowledge and require sources}} Button cells are usually disposable [[primary cell]]s, but some are [[Rechargeable battery|rechargeable]] secondary cells. Common [[Anode#Battery_or_galvanic_cell_anode|anode]] materials are [[zinc]] or [[lithium]]. Common [[Cathode#Galvanic_cell|cathode]] materials are [[manganese dioxide]], [[silver oxide]], [[carbon monofluoride]], [[cupric oxide]] or [[oxygen]] from the air.{{Citation needed|date=August 2023|reason=technical specifications are not common knowledge and require sources}} [[Mercury battery|Mercuric oxide]] button cells were formerly common, but are no longer available due to the [[toxicity]] and [[Natural environment|environmental]] [[Mercury (element)#Toxicity and safety|effects of mercury]]. Button cells are dangerous for small children, as when swallowed they can cause severe internal burns and significant injury or death.&lt;ref name="BBC, 2016">{{Cite news |title=See what a button battery can do to a child's throat |date=22 September 2016 |newspaper=[[BBC News Online]] |url=https://www.bbc.co.uk/news/health-37435364 |url-status=live |archive-url=https://web.archive.org/web/20160922220446/http://www.bbc.co.uk/news/health-37435364 |archive-date=22 September 2016 }}&lt;/ref> [[Duracell]] has attempted to mitigate this by adding a [[Bitterant|bitter coating]] to their batteries.&lt;ref>{{Cite web|title=Duracell Is Making Coin Batteries Taste Horrible on Purpose|url=https://www.pcmag.com/news/duracell-is-making-coin-batteries-taste-horrible-on-purpose|access-date=2022-02-17|website=PCMAG|language=en}}&lt;/ref> ==Properties of cell chemistries== Cells of different chemical composition made in the same size are mechanically interchangeable. However, the composition can affect service life and [[Chemical stability|voltage stability]]. Using the wrong cell may lead to short life or improper operation (for example, [[light meter]]ing on a camera requires a stable voltage, thus silver cells are usually specified). Sometimes different cells of the same type, size and capacity are optimized for different loads by using different [[Electrolytic capacitor|electrolytes]], so that one may have longer service life than the other when supplying a relatively high [[Electric current|current]].{{Citation needed|date=August 2023|reason=technical specifications are not common knowledge and require sources}} [[Alkaline battery|Alkaline batteries]] are made in the same button sizes as the other types, but typically provide less capacity and less stable voltage than more costly silver oxide or lithium cells.&lt;ref>[https://www.amazon.co.uk/Hyundai-791-522-Alkaline-button/dp/B000N209OM Alkaline button cell]. amazon.co.uk. A card marked with the name Hyundai with 30 button cells in 5 sizes made in China, stating that they are alkaline but with pictures of watches, calculators, etc. is sold for prices ranging from about £1 to £4 in the UK&lt;/ref> [[Silver-oxide battery|Silver cells]] may have an output voltage that is stable until it suddenly drops at end of life. This varies for individual types; one manufacturer ([[Energizer]]) offers three silver oxide cells of the same size, 357–303, 357-303H and EPX76, with capacities ranging from 150 to 200&amp;nbsp;[[Ampere hour|mAh]], [[voltage]] characteristics ranging from gradually reducing to fairly constant, and some stated to be for continuous low drain with high pulse on demand, others for photo use.{{Citation needed|date=October 2019}} [[Mercury battery|Mercury batteries]] also supply a stable voltage, but are banned in many countries due to their [[toxicity]] and environmental impact.{{Citation needed|date=August 2023|reason=technical specifications are not common knowledge and require sources}} [[Zinc-air battery|Zinc-air batteries]] use air as the [[depolarizer]] and have much higher capacity than other types, as they take that air from the atmosphere. Cells have an air-tight seal which must be removed before use; they will then dry out in a few weeks, regardless of use.{{Citation needed|date=August 2023|reason=technical specifications are not common knowledge and require sources}} For comparison, the properties of some cells from one manufacturer with diameter 11.6&amp;nbsp;mm and height 5.4&amp;nbsp;mm were listed in 2009 as:&lt;ref name=energizer2>[http://data.energizer.com/ Energizer website] {{webarchive|url=https://web.archive.org/web/20090828093736/http://data.energizer.com/ |date=2009-08-28 }}, with datasheets for many batteries of several chemistries&lt;/ref> *Silver: capacity 200 mAh to an end-point of 0.9&amp;nbsp;V, [[internal resistance]] 5–15&amp;nbsp;Ω, weight 2.3&amp;nbsp;g *Alkaline (manganese dioxide): 150 mAh (0.9), 3–9 Ω, 2.4 g *Mercury: 200 mAh, 2.6 g *Zinc-air: 620 mAh, 1.9 g Examining datasheets for a manufacturer's range&lt;ref name=energizer2/> may show a high-capacity alkaline cell with a capacity as high as one of the lower-capacity silver types; or a particular silver cell with twice the capacity of a particular alkaline cell. If the powered equipment requires a relatively high voltage (e.g., 1.3&amp;nbsp;V) to operate correctly, a silver cell with a flat discharge characteristic will give much longer service than an alkaline cell—even if it has the same specified capacity in mAh to an end-point of 0.9&amp;nbsp;V. If a device seems to "eat up" batteries after the original supplied by the manufacturer is replaced, it may be useful to check the device's requirements and the replacement battery's characteristics. For [[Caliper#Digital caliper|digital calipers]], in particular, some are specified to require at least 1.25&amp;nbsp;V to operate and others 1.38&amp;nbsp;V.&lt;ref>[http://www.truetex.com/buttons.htm Buying Button Cells for Digital Calipers] {{webarchive|url=https://web.archive.org/web/20100727054346/http://www.truetex.com/buttons.htm |date=2010-07-27 }}. Truetex.com. Retrieved on 2015-11-08.&lt;/ref>&lt;ref name=battery>[http://www.davehylands.com/Machinist/Caliper-Batteries/ Caliper Battery Life] {{webarchive|url=https://web.archive.org/web/20100621072728/http://www.davehylands.com/Machinist/Caliper-Batteries/ |date=2010-06-21 }}. Davehylands.com. Retrieved on 2015-11-08.&lt;/ref> While alkaline, silver oxide, and mercury batteries of the same size may be mechanically interchangeable in any given device, use of a cell of the right voltage but unsuitable characteristics can lead to short battery life or failure to operate equipment. Common [[Lithium battery|lithium]] primary cells, with a terminal voltage around 3 volts, are not made in sizes interchangeable with 1.5 volt cells. Use of a battery of significantly higher voltage than equipment is designed for can cause permanent damage. ==Type designation== {{see also|Battery nomenclature}} [[File:LR44 Button Cell Battery IEC Standard Version.jpg|240px|thumb|LR44 alkaline cell|alt=]] [[International standard]] [[International Electrotechnical Commission|IEC]] 60086-3 defines an alphanumeric coding system for "Watch batteries". Manufacturers often have their own naming system; for example, the cell called LR1154 by the IEC standard is named AG13, LR44, 357, A76, and other names by different manufacturers. The IEC standard and some others encode the case size so that the numeric part of the code is uniquely determined by the case size; other codes do not encode size directly. Examples of batteries conforming to the IEC standard are CR2032, SR516, and LR1154, where the letters and numbers indicate the following characteristics. ===Electrochemical system=== The first letter in the IEC standard system identifies the chemical composition of the battery, which also implies a nominal voltage: {| class=wikitable ! Letter&lt;br> code ! Common&lt;br> name ! Positive&lt;br> electrode ! Electrolyte ! Negative&lt;br> electrode ! Nominal&lt;br> voltage (V) ! End-point&lt;br> voltage (V) ! Maximum&lt;br> voltage (V) ! Comments |- | - || [[Zinc-carbon battery|Zinc-carbon]] || [[Manganese dioxide]] || [[Zinc chloride]] || [[Zinc]] || 1.5 || ? || 1.72 || |- | L || [[Alkaline battery|Alkaline]] || [[Manganese dioxide]] || [[Alkali metal hydroxide|Alkali]] || [[Zinc]] || 1.5 || 1.0 || 1.65 || Much higher capacity than zinc-carbon. |- | S || [[Silver-oxide battery|Silver]] || [[Silver oxide]] || Alkali || Zinc || 1.55 || 1.2 || 1.63 || SR synonymous to AG. Much flatter discharge curve than L. Slightly higher nominal capacity, much higher effective capacity for devices with higher cutoff voltage (eg. digital calipers). |- | P || [[Zinc-air battery|Zinc-air]] || [[Oxygen]] || Alkali || Zinc || 1.4 || 1.2 || 1.68 || High capacity. Activated by removing seal from vent. Electrolyte can dry out. |- | C || [[Lithium battery|Lithium]] || [[Manganese dioxide]] || Organic || Lithium || 3 || 2.0 || 3.7 || Very common. Gradual loss of voltage with discharge. |- | B || || [[Carbon monofluoride]] || Organic || Lithium || 3 || 2.0 || 3.7 || Similar to C, with better performance and lower self-discharge at higher temperatures; lower initial voltage, flatter discharge curve. |- | G || || [[Copper(II) oxide|Copper oxide]] || Organic || Lithium || 1.5 || 1.2 || 2.3 || |- | Z || [[Nickel oxyhydroxide battery|Nickel oxyhydroxide]] || Manganese dioxide, nickel oxyhydroxide || Alkali|| Zinc || 1.5 || ? || |- | E || Thionyl chloride || [[Thionyl chloride]] || Organic || Lithium || 3.6 || ? || 3.9 || |- | F || Iron sulfide || [[Iron disulfide]] || Organic || Lithium || 1.5 || ? || 1.83 || Low temperature, high capacity |- | M, N (withdrawn) || [[Mercury battery|Mercury]] || [[Mercuric oxide]] || Alkali || Zinc || 1.35/1.40 || 1.1 || ? |} For types with stable voltage falling precipitously at end-of-life (cliff-top voltage-versus-time graph), the end-voltage is the value at the "cliff-edge", after which the voltage drops extremely rapidly. For types which lose voltage gradually (slope graph, no cliff-edge), the end-point is the voltage beyond which further discharge will cause damage to the battery and possibly the device it is powering, typically 1.0 or 0.9&amp;nbsp;V. Common names are conventional rather than uniquely descriptive; for example, a ''silver (oxide) cell'' has an alkaline electrolyte. ''L'', ''S'', and ''C'' type cells are today the most commonly used types in [[quartz watch]]es, [[calculator]]s, small [[personal digital assistant|PDA]] devices, computer clocks, and [[blinky (novelty)|blinky lights]]. Miniature [[zinc-air battery|zinc-air batteries]] – ''P'' type – are used in [[hearing aid]]s and medical instruments. In the IEC system, larger cells may have no prefix for the chemical system, indicating they are [[Zinc–carbon battery|zinc-carbon batteries]]; such types are not available in button cell format. The second letter, '''R''', indicates a round (cylindrical) form. The standard only describes primary batteries. Rechargeable types made in the same case size will carry a different prefix not given in the IEC standard, for example some ''ML'' and ''LiR'' button cells use rechargeable lithium technology. For rechargeables, the IEC prefixes are: &lt;ref>Battery Standards and Sizes. (2005). Batteries for Portable Devices, 29–32. doi:10.1016/b978-044451672-5/50003-x &lt;/ref> * H - alloy-nickel oxide with aqueous electrolyte, 1.2V * K - cadmium-nickel oxide with aqueous electrolyte, 1.2V * PB - lead-lead dioxide with sulfuric acid electrolyte, 2V * IC - lithium-cobalt oxide with organic electrolyte, 3.8V * IN - lithium-nickel oxide with organic electrolyte, 3.8V * IM - lithium-manganese oxide with organic electrolyte, 3.8V {| class=wikitable ! Prefix ! Rechargeable ! Chemistry ! Nominal voltage (V) ! Comments |- | LPM, LiR, RJD, RCR || yes || [[lithium-ion battery|Li-ion]] || 3.7 || sometimes called "rechargeable CR"; higher voltage than CR can cause damage when used as direct replacement, may be lowered with a serial diode or regulator |- | ML || yes || LiMnO2 || 3 || "manganese"; -20..+60 °C, 2.8..3.2V charging; common for long-term memory/[[realtime clock|RTC]] backups; plateaus at 2.5V |- | MS || yes || LiMnSi || 3 || "manganese silicon"; -20..+60 °C, 2.8..3.3V charging; better charge/discharge characteristics than VL or ML; common for memory/RTC backups |- | VL || yes || LiV2O5 || 3 || "vanadium", eg, VL1220, VL2020, VL2330, VL3032; -20..+60 °C, 3.25..3.55V charging; lower voltage drop on load |- | CTL || yes || CoTiLi || 2.3 || "cobalt titanium"; -20..+60 °C, 2.5..2.7V charging; common in solar watches, sometimes called "watch capacitor" |- | MT || yes || LiMnTi || 1.5 || "manganese titanium"; -10..+60 °C, 1.8..2.6V charging |- | V, MH || yes || [[Nickel–metal hydride battery|NiMH]] || 1.2 || can replace LR/SR cells if lower voltage than 1.5V is not a problem |- | TL || no || LiSoCl2 || 3.6 || "thionyl chloride"; for low temperatures |} ===Package size=== [[File:Button cells and 9v cells (3).png|thumb|upright=1.5|Several sizes of button and coin cell with four 9&amp;nbsp;V batteries as a size comparison]] 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&amp;nbsp;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. {| class=wikitable |+ Diameter codes (1st 1 or 2 digits) ! Number &lt;br/>code ! Nominal &lt;br/>diameter (mm) ! Tolerance &lt;br/>(mm) |- |'''4'''||4.8 ||±0.15 |- |'''5'''||5.8 ||±0.15 |- |'''6'''||6.8 ||±0.15 |- |'''7'''||7.9 ||±0.15 |- |'''9'''||9.5 ||±0.15 |- |'''10'''||10.0||±0.20 |- |'''11'''||11.6||±0.20 |- |'''12'''||12.5||±0.25 |- |'''16'''||16.0||±0.25 |- |'''20'''||20.0||±0.25 |- |'''23'''||23.0||±0.50 |- |'''24'''||24.5||±0.50 |- |'''44'''||11.6||±0.20 |} Examples: *CR2032: lithium, 20&amp;nbsp;mm diameter, 3.2&amp;nbsp;mm height, 220 mAh *CR2032H; lithium, 20&amp;nbsp;mm diameter, 3.2&amp;nbsp;mm height 240 mAh *CR2025: lithium, 20&amp;nbsp;mm diameter, 2.5&amp;nbsp;mm height, 170 mAh *SR516: silver, 5.8&amp;nbsp;mm diameter, 1.6&amp;nbsp;mm height *LR1154/SR1154: alkaline/silver, 11.6&amp;nbsp;mm diameter, 5.4&amp;nbsp;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.&lt;ref>[http://www.panasonic.com/industrial/batteries-oem/oem/primary-coin-cylindrical/br-cr.aspx Panasonic CR battery data page] {{webarchive|url=https://web.archive.org/web/20130702222839/http://www.panasonic.com/industrial/batteries-oem/oem/primary-coin-cylindrical/br-cr.aspx |date=2013-07-02 }}, showing many batteries in plug-in and horizontal and vertical solder versions. The same site lists rechargeable cells with various chemistries, in the same sizes and options as disposable batteries of the same size code and hence mechanically interchangeable, though carrying risks of malfunctioning and damage.&lt;/ref> ===Letter suffix=== After the package code, the following additional letters may optionally appear in the type designation to indicate the electrolyte used: *P: [[potassium hydroxide]] electrolyte *S: [[sodium hydroxide]] electrolyte *No letter: organic electrolyte *SW: low drain type for quartz watches (analog or digital) without light, alarm, or chronograph functions *W: high drain type for all quartz watches, calculators and cameras. The battery complies with all the requirements of the international IEC 60086-3&lt;ref>[http://webstore.iec.ch/p-preview/info_iec60086-3%7Bed2.0%7Den_d.pdf IEC 60086-3 Standard for Watch Batteries (withdrawn)] {{webarchive|url=https://web.archive.org/web/20130627045835/http://webstore.iec.ch/p-preview/info_iec60086-3%7Bed2.0%7Den_d.pdf |date=2013-06-27 }}. (PDF) . Just scope/preview. Retrieved on 2015-11-08.&lt;/ref> standard for watch batteries. [[File:Battery-lithium-cr2032.jpg|right|thumb|150px|Type CR2032 watch battery (lithium anode, 3&amp;nbsp;V, 20.0&amp;nbsp;mm × 3.2&amp;nbsp;mm)]] [[File:LeakedBattery 2585a.jpg|thumb|right|150px|[[Battery leakage|Leaked]] and corroded button cell]] ===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. ==== Date codes ==== Often a 2-letter code (sometimes on the side of the battery) where the first letter identifies the manufacturer and the second is the year of manufacture. For example: * YN – the letter N is the 14th letter in the alphabet – indicates the cell was manufactured in 2014. There is no universal standard. The manufacturing date can be abbreviated to the last digit of the year, followed by a digit or letter indicating the month, where O, Y, and Z are used for October, November and December, respectively (e.g., 01 = January 2010 or 2000, 9Y = November 2019 or 2009). ===Common manufacturer code=== A code used by some manufacturers is ''AG'' (alkaline) or ''SG'' (silver) followed by a number, as follows {| class="wikitable" |- ! G code !! IEC code |- | xG0 || 521 |- | xG1 || 621 |- | xG2 || 726 |- | xG3 || 736 |- | xG4 || 626 |- | xG5 || 754 |- | xG6 || 920 or 921 |- | xG7 || 926 or 927 |- | xG8 || 1120 or 1121 |- | xG9 || 936 |- | xG10 || 1130 or 1131 |- | xG11 || 721 |- | xG12 || 1142 |- | xG13 || 1154 |} To those familiar with the [[Ag (element)|chemical symbol for silver, Ag]], this may suggest incorrectly that AG cells are silver. ==Rechargeable variants== [[File:Coin cells being tested.jpg|thumb|170px|Coin cells being tested]]In addition to disposable (single use) button cells, [[rechargeable battery|rechargeable batteries]] in many of the same sizes are available, with lower capacity than disposable cells. Disposable and rechargeable batteries are manufactured to fit into a holder or with solder tags for permanent connection. In equipment with a battery holder, disposable or rechargeable batteries may be used, if the voltage is compatible. A typical use for a small rechargeable battery (in coin or other format) is to back up the settings of equipment which is normally permanently mains-powered, in the case of power failure. For example, many central heating controllers store operation times and similar information in [[volatile memory]], lost in the case of power failure. It is usual for such systems to include a backup battery, either a disposable in a holder (current drain is extremely low and life is long) or a soldered-in rechargeable.&lt;ref>[http://www.kiddefirex.co.uk/utcfs/ws-5250/Assets/Datasheet%20KF3.pdf Datasheet of a mains-powered smoke alarm, with models backed up by disposable battery or by rechargeable UL2330 button battery] {{webarchive|url=https://web.archive.org/web/20130805050433/http://www.kiddefirex.co.uk/utcfs/ws-5250/Assets/Datasheet%20KF3.pdf |date=2013-08-05 }}. Kiddefirex.co.uk (2015-10-01). Retrieved on 2015-11-08.&lt;/ref> Rechargeable [[nickel-cadmium battery|NiCd]] button cells were often components of the backup battery of older computers; non-rechargeable lithium button cells with a lifetime of several years are used in later equipment. {{see also|Lithium battery#Chemistries|Lithium-ion battery#Shapes}} Rechargeable batteries typically have the same dimension-based numeric code with different letters; thus CR2032 is a disposable battery while ML2032, VL2032 and LIR2032 are rechargeables that fit in the same holder if not fitted with solder tags. It is mechanically possible, though hazardous, to fit a disposable battery in a holder intended for a rechargeable; holders are fitted in parts of equipment only accessible by service personnel in such cases. ==Health issues== === Accidental ingestion === [[Image:Keep-out-of-reach-of-children.svg|thumb|170px|KEEP OUT OF REACH OF CHILDREN icon required by IEC 60086-4&lt;ref>{{cite book|date=|title=''IEC 60086-4:2019'' Primary batteries - Part 4: Safety of lithium batteries |chapter=Clause 9: Marking and packaging | publisher=IEC |url=https://webstore.iec.ch/preview/info_iec60086-4%7Bed5.0.RLV%7Den.pdf |location=Geneva |isbn=978-2-8322-6808-7}}&lt;/ref>]] Button cells are attractive to small children; they may put them in their mouth and swallow them. The ingested battery can cause significant damage to internal organs. The battery reacts with bodily fluids, such as mucus or saliva, creating a circuit which can release an alkali that is strong enough to burn through human tissue.&lt;ref name="GOSH">{{Cite web|url=https://www.gosh.nhs.uk/conditions-and-treatments/conditions-we-treat/button-batteries-using-them-safely|title=Button batteries – using them safely|date=October 2018|website=Great Ormond Street Hospital|publisher=Great Ormond Street Hospital for Children|language=en|access-date=2019-10-19}}&lt;/ref>&lt;ref name="SN">Paull, John (2022) [http://www.academia.edu/84055214/Silent_Nursery_Button_Battery_Fatalities_in_Children_the_Long_Road_from_Externality_to_Obsolescence Silent Nursery: Button Battery Fatalities in Children – the Long Road from Externality to Obsolescence], International Journal of Clinical and Experimental Medicine Research, 6 (3): 301–308.&lt;/ref> Swallowed batteries can cause damage to the lining of the [[esophagus]], and can create a hole in the esophagus lining in two hours.&lt;ref name="GOSH" /> In severe cases, damage can cause a passage between the esophagus and the [[trachea]]. Swallowed button cells can damage the vocal cords. They can even burn through the blood vessels in the chest area, including the [[aorta]].&lt;ref name="GOSH" /> In the United States, 44 child deaths were reported from button battery ingestion in 2002–2021.&lt;ref name="SN"/> In [[Greater Manchester]], England, with a population of 2,700,000, two children between 12 months and six years old died, and five suffered life-changing injuries, in the 18 months leading up to October 2014. In the United States, on average, over 3,000 pediatric ingestions of button batteries are reported annually. The proportion of major and fatal outcomes is increasing.&lt;ref name=":0">{{Cite web|url=https://www.poison.org/battery/stats|title=Button Battery Statistics|website=www.poison.org|language=en|access-date=2018-06-30}}&lt;/ref> Coin cells of diameter 20&amp;nbsp;mm or greater cause the most serious injuries, even if expended and intact.&lt;ref name=":0" />&lt;ref name=":1">{{Cite journal|last1=Litovitz|first1=Toby|last2=Whitaker|first2=Nicole|last3=Clark|first3=Lynn|last4=White|first4=Nicole C.|last5=Marsolek|first5=Melinda|date=2010-06-01|title=Emerging Battery-Ingestion Hazard: Clinical Implications|url=http://pediatrics.aappublications.org/content/125/6/1168|journal=Pediatrics|language=en|volume=125|issue=6|pages=1168–1177|doi=10.1542/peds.2009-3037|issn=0031-4005|pmid=20498173|doi-access=}}&lt;/ref> In Auckland, New Zealand as of 2018 there are about 20 cases per year requiring hospitalization.&lt;ref>{{Cite web|url=http://www.stuff.co.nz/life-style/parenting/101091235/risk-of-swallowing-deadly-button-batteries-prompts-new-industry-safety-policy|title=Risk of swallowing deadly button batteries prompts new industry safety policy|website=Stuff|date=February 2018 |language=en|access-date=2018-04-07}}&lt;/ref> In 2020, [[Duracell]] announced that they were coating some of their lithium button cells with a [[bitterant]] compound to discourage children from ingesting them.&lt;ref>{{Cite web|last=Gartenberg|first=Chaim|date=2020-09-29|title=Duracell's new coin batteries have a bitter coating that makes them taste terrible|url=https://www.theverge.com/2020/9/29/21493443/duracell-new-coin-batteries-bitter-coating-taste-terrible-child-protection|access-date=2020-09-29|website=The Verge|language=en}}&lt;/ref> An alternative solution is to [[design]] (or [[litigate]]) the offending cells, mostly 20mm [[lithium]] cells, out of the supply chain.&lt;ref name="BBs">Paull, John (2021). [http://www.academia.edu/49259463/Button_Batteries_and_Child_Deaths_Market_Failure_of_Unsafe_Products Button batteries and child deaths: Market failure of unsafe products], International Journal of Clinical and Experimental Medicine Research, 2021, 5(3), 297–303 &lt;/ref> Children most at risk of button battery ingestion are those aged 5 years and under.&lt;ref name=BBs/> Three child deaths in Australia reveal that in each case: i) the ingestion was not witnessed, ii) the source of the battery remains unknown, iii) initial [[misdiagnosis]] delayed appropriate intervention, iv) diagnosis was confirmed by X-ray, v) in each case the battery lodged in the child's oesophagus, vi) the offending batteries were 20mm lithium cells, vii) death occurred 19 days to 3 weeks after ingestion.&lt;ref name=BBs /> The presenting symptoms of button cell ingestion may be misdiagnosed and attributed to common non life-threatening childhood maladies. ===Mercury and cadmium=== Some button cells contain [[Mercury (element)|mercury]] or [[cadmium]], which are toxic. In early 2013 the [[European Parliament Committee on the Environment, Public Health and Food Safety|European Parliament Environment Committee]] voted for a ban on the export and import of a range of mercury-containing products such as button cells and other batteries, to be imposed from 2020.&lt;ref name="EU Dir. Summary">{{cite web|title=EUBatteryDirective (2006/66/EC) Summary|url=http://data.energizer.com/PDFs/eubattdirectivesummary.pdf|work=8 December 2009|publisher=Eveready Battery Company, Inc.|access-date=20 June 2013|url-status=live|archive-url=https://web.archive.org/web/20120710210826/http://data.energizer.com/PDFs/eubattdirectivesummary.pdf|archive-date=10 July 2012}}148 Kb&lt;/ref>&lt;ref>[http://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX:32013L0056 "Directive 2013/56/EU amending Directive 2006/66/EC"] {{webarchive|url=https://web.archive.org/web/20160304235055/http://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX%3A32013L0056 |date=2016-03-04 }}, European Parliament &amp; Council, 20 November 2013, Retrieved 7 April 2015&lt;/ref> ==See also== *[[List of battery sizes]] *[[List of battery types]] *[[Battery recycling]] *[[Artificial cardiac pacemaker]] *[[Implantable cardioverter-defibrillator]] ==References== {{reflist|30em}} ==Sources== {{refbegin}} * IEC 60086-3: Primary batteries – Part 3: Watch batteries. [[International Electrotechnical Commission]], Geneva, 1995. (also: BS EN 60086-3:1996) * Sample of data sheets available from [http://data.energizer.com Energizer] : {{cite web|url=http://data.energizer.com/PDFs/cr2032.pdf|title=CR2032 Technical Details}}&amp;nbsp;{{small|(56.2&amp;nbsp;[[Kibibyte|KiB]])}} * {{cite web|url=http://www.sustainableproduction.org/downloads/MaineDEPButtonBatteryReportFinal12-17-04.pdf|title=An Investigation of Alternatives to Miniature Batteries Containing Mercury}}&amp;nbsp;{{small|(440&amp;nbsp;[[Kibibyte|KiB]])}} {{refend}} ==External links== {{Commons category|Button cells}} *[http://www.zbattery.com/Coin-Cell-Reference.html Coin cell reference table] *[http://www.watchbattery.co.uk/Watch_Battery_Cross_Reference_Table.php Watch battery cross reference table] *{{cite web |url=http://image.sciencenet.cn/olddata/kexue.com.cn/bbs/upload/15791IEC60086-2_%7B10[1][1].1%7D(2001-10).pdf |archive-url=https://web.archive.org/web/20131102015107/http://image.sciencenet.cn/olddata/kexue.com.cn/bbs/upload/15791IEC60086-2_%7B10[1][1].1%7D(2001-10).pdf |url-status=dead |archive-date=2013-11-02 |title=IEC 60086-2 Primary batteries – Part 2: Physical and electrical specifications }} (includes discharge characteristics) *{{cite web|url= http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2006:266:0001:0014:en:PDF |title=DIRECTIVE 2006/66/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL }}&amp;nbsp;{{small|(407&amp;nbsp;Kb)}} 6 September 2006 (re recycling and disposal of batteries) {{Battery sizes}} {{Portal bar|Energy|Electronics}} [[Category:Battery shapes]] </textarea><div class="templatesUsed"><div class="mw-templatesUsedExplanation"><p><span id="templatesused">Pages transcluded onto the current version of this page<span class="posteditwindowhelplinks"> (<a href="/wiki/Help:Transclusion" title="Help:Transclusion">help</a>)</span>:</span> </p></div><ul> <li><a 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