Button cell

Button cells

Scheme of a button cell (mercury oxide, silver oxide or lithium cell)

A button cell is in electrical engineering an electrochemical cell having a round cross-section, whose total height is less than the overall diameter and the cell voltages from 1.35 to 3.6  volt outputs. It got its name from the design, which is similar in size and shape to a button . Similarly, they are called button cells or particularly flat specimens in English, coin cells ("coin" = coin). Depending on the electrode material, a distinction is made between a. Silver oxide , mercury oxide or lithium cells .

Colloquially, the term battery is sometimes incorrectly used for button cell , but it refers to the interconnection of several electrochemical cells.

Button cells are used as a voltage source in devices that have a low power requirement or that are rarely used. Examples are pocket calculators , wristwatches , hearing aids , mini-flashlights or the buffering of static SRAM components on mainboards in computers .

The first button cells were mercury oxide-zinc cells and were introduced by Samuel Ruben for the US military in 1942 .

Areas of application / distinction

commitment

For different requirements, there are different types of batteries, which differ from the voltage curve to the durability and should also be used accordingly. For wristwatches, it is usually silver oxide batteries, for all-round applications, such as. B. for small LED flashlights or children's toys, cheaper alkaline batteries.

Li Mn button cell from the manufacturer Varta

Lithium button cells are used wherever a power supply is required for a long time, e.g. B. Type CR2032 in computers on motherboards to act as a backup battery to ensure the voltage supply for the clock and the CMOS RAM when the computer is disconnected from the mains or switched off. Also, CR2016, CR2025, etc. are commonly used lithium button cells that are found in smaller electronic devices and many car keys . In a few cases there are also wristwatches with lithium batteries, which are then noticeably large (example CR2320).

Alkaline-manganese button cells are very inexpensive and are therefore often used in small electronic devices such as e.g. B. pocket calculators, and also used in flashlights with LED technology. Since these batteries can leak, they should never be used as a replacement in a watch. Names like L1154, LR44, V13GA, AG13, KA76, LR44H and GPA76 all refer to the same type of battery.

Silver oxide button cells with designations such as SR1154, SR44, SR44SW or 303 are in most cases used in wristwatches. A distinguishing feature within these types is the current-carrying capacity:
 * Low-Drain : Lower current-carrying capacity, e.g. B. for watches with high leakage security ( electrolyte , caustic soda).
 * High drain : higher current carrying capacity, e.g. B. for photo and remote control applications, with good leakage protection (electrolyte potassium hydroxide).

Zinc-air button cells are primarily used as hearing aid batteries .

In addition to the mercury-zinc button cells (30% Hg) that were no longer manufactured , silver oxide cells (1% Hg) and zinc-air button cells (2% Hg) also contained mercury. Since autumn 2015, the use of mercury has also been banned within the EU.

Dimensions

Button cells in size comparison with a 9 volt block in the center of the picture

Identical dimensions do not mean that they are the same type of battery. Some suppliers use a wide variety of designations for a product, the dimensions being identical, but different battery types (silver oxide 1.55 V, alkaline 1.5 V, zinc-air 1.4 V) such as SR41, AG3, SG3 , LR41, PR41, 192, 384, 392. Such listings list silver oxide watch batteries, alkaline button cells and zinc-air hearing aid batteries as supposedly compatible.

The self-discharge rate of a battery depends on the electrode material and is very different; In addition to design and capacity, it is one of the selection criteria for the respective application: The battery in a clock or a digital clinical thermometer should last as many years as possible and therefore have a low self-discharge. As a rule, silver oxide cells can also be used instead of alkaline manganese cells. So compatibility and price are rarely the only criteria when choosing a battery.

→ Main article : List of all standard sizes for round cells according to IEC-60086 up to 1990

Explanations for the table:

• "Type IEC 1" column: size designations according to method 1 of the IEC-60086 standard. There was still no connection between type number and cell size. Standard sizes were simply specified or included in the standard and numbered consecutively.
• Column " ø " and "height": total diameter and total height in millimeters.
• Column "N./max": For some types are the millimeter indications as N ennwert in the standard set (nominal cell dimensions) , for most as Max imalwert ( Maximum battery dimensions ).
• Column "Type IEC 2": IEC size designations according to method 2 (from October 1990) - This column was added here separately. The designations result from the maximum values ​​for diameter and height. Since for some types only the nominal values ​​are mentioned in the standard, it may not be possible to infer the IEC-2 designations directly, which is why these only appear in italics.
• "Shape" column: All round cells whose height is smaller than their diameter are considered button cells and are highlighted in orange .

All standard sizes for round cells defined in IEC-60086 according to method 1

Type IEC 1	O	height	N. / max	Type IEC 2	shape
R06	10.0 mm	22.0 mm	N.	R10220	H ≥ ø
R03	10.5 mm	44.5 mm	Max.	R10445	H ≥ ø , AAA, Micro
R01	12.0 mm	14.7 mm	Max.	R12147	H ≥ ø
R0	11.0 mm	19.0 mm	N.	R11190	H ≥ ø
R1	12.0 mm	30.2 mm	Max.	R12302	H ≥ ø , N, Lady
R3	13.5 mm	25.0 mm	N.	R13250	H ≥ ø
R4	13.5 mm	38.0 mm	N.	R13380	H ≥ ø
R6	14.5 mm	50.5 mm	Max.	R14505	H ≥ ø , AA, Mignon
R9	16.0 mm	6.2 mm	Max.	R1662	H < ø , button cell
R10	21.8 mm	37.3 mm	Max.	R21373	H ≥ ø
R12	21.5 mm	60.0 mm	Max.	R21600	H ≥ ø
R14	26.2 mm	50.0 mm	Max.	R26500	H ≥ ø , C, baby
R15	24.0 mm	70.0 mm	N.	R24700	H ≥ ø
R17	25.5 mm	17.0 mm	N.	R25170	H < ø , button cell
R18	25.5 mm	83.0 mm	N.	R25830	H ≥ ø
R19	32.0 mm	17.0 mm	N.	R32170	H < ø , button cell
R20	34.2 mm	61.5 mm	Max.	R34615	H ≥ ø , D, mono
R22	32.0 mm	75.0 mm	N.	R32750	H ≥ ø
R25	32.0 mm	91.0 mm	N.	R32910	H ≥ ø
R26	32.0 mm	105.0 mm	N.	R32 / 105	H ≥ ø
R27	32.0 mm	150.0 mm	N.	R32 / 150	H ≥ ø
R40	67.0 mm	172.0 mm	Max.	R67 / 172	H ≥ ø
R41	7.9 mm	3.6 mm	Max.	R736	H < ø , button cell
R42	11.6 mm	3.6 mm	Max.	R1136	H < ø , button cell
R43	11.6 mm	4.2 mm	Max.	R1142	H < ø , button cell
R44	11.6 mm	5.4 mm	Max.	R1154	H < ø , button cell
R45	9.5 mm	3.6 mm	N.	R936	H < ø , button cell
R48	7.9 mm	5.4 mm	Max.	R754	H < ø , button cell
R50	16.4 mm	16.8 mm	Max.	R16168	H ≥ ø
R51	16.5 mm	50.0 mm	N.	R16500	H ≥ ø
R52	16.4 mm	11.4 mm	Max.	R16114	H < ø , button cell
R53	23.2 mm	6.1 mm	Max.	R2361	H < ø , button cell
R54	11.6 mm	3.1 mm	Max.	R1130	H < ø , button cell
R55	11.6 mm	2.1 mm	Max.	R1121	H < ø , button cell
R56	11.6 mm	2.6 mm	Max.	R1126	H < ø , button cell
R57	9.5 mm	2.7 mm	Max.	R927	H < ø , button cell
R58	7.9 mm	2.1 mm	Max.	R721	H < ø , button cell
R59	7.9 mm	2.6 mm	Max.	R726	H < ø , button cell
R60	6.8 mm	2.2 mm	Max.	R621	H < ø , button cell
R61	7.8 mm	39.0 mm	N.	R7390	H ≥ ø
R62	5.8 mm	1.7 mm	Max.	R516	H < ø , button cell
R63	5.8 mm	2.2 mm	Max.	R521	H < ø , button cell
R64	5.8 mm	2.7 mm	Max.	R527	H < ø , button cell
R65	6.8 mm	1.7 mm	Max.	R616	H < ø , button cell
R66	6.8 mm	2.6 mm	Max.	R626	H < ø , button cell
R67	7.9 mm	1.7 mm	Max.	R716	H < ø , button cell
R68	9.5 mm	1.7 mm	Max.	R916	H < ø , button cell
R69	9.5 mm	2.1 mm	Max.	R921	H < ø , button cell
R70	5.8 mm	3.0 mm	Max.	R530	H < ø , button cell

tension

The voltage of a button cell depends on its chemical composition.

Test device for button cells

Cell type	1st letter of the IEC designation	nominal voltage	Examples b
Mercury Oxide Zinc Cell a	M.	1.35V	MR52
Zinc-air cell	P	1.4 V (or 1.45 V)	PR41
Alkaline manganese cell	L.	1.5V	LR44 L1154
Nickel oxyhydroxide cell	Z	1.5 V (or 1.65 V)	ZR66
Silver oxide zinc cell	S.	1.55V	SR44 SR1154
Lithium manganese dioxide cell	C.	3.0V	CR2016 CR2025 CR2032
Lithium carbon monofluoride cell	B.	3.0V	BR2016

^aButton cells that contain more than 0.0005 percent by weight of mercury are no longer allowed to be placed on the EU market since October 2015.

^bThe second letter "R" stands for engl. "Round", ie a cylindrical shape.

capacity

The smaller a button cell, the lower the amount of charge contained in the cells , which is expressed in milliampere hours (mAh) . Despite the very small capacities, button cells, especially in wristwatches and pocket calculators with liquid crystal displays (LCD), can have a service life that can be measured in years.

Because of the discharge through leakage currents, contamination (e.g. traces of grease from fingers) should be avoided.

Silver oxide cells usually have a higher nominal capacity than alkaline manganese cells.

Structure of the model numbers

Lithium button cells

Lithium button cell CR 2025 with welded connections

C R1620 = lithium battery with 16 mm diameter and 2.0 mm height. The "C R " stands for a lithium battery as R undzelle, then the diameter follows in mm, the last digits indicate the thickness in ¹ / ₁₀  mm to. Manufacturer's own names have hardly spread for lithium button cells.

Alkaline button cells

L R1154 = Alkaline battery with a diameter of 11.6 mm and a height of 5.4 mm. The "L R " stands for an alkaline battery as R undzelle, then the diameter follows in mm (rounded), the last digits indicate the thickness in ¹ / ₁₀  mm to. A wide variety of names are repeatedly used for these button cells and sometimes mixed with one another. There is even packaging on which the designations SR44, LR44, 357 and L1154 are mentioned in one line. So it is z. B. an alkaline and a silver oxide battery. The batteries have the same dimensions.

Silver oxide button cells

S R626 = silver oxide battery with 6 mm diameter and 2.6 mm height. The " SR " stands for an S ilberoxid battery as R undzelle, then the diameter follows in mm (rounded). The last digits indicate the thickness in ¹ ⁄ ₁₀  mm. These batteries are mainly used in wristwatches. The advantage of silver oxide batteries is that the voltage remains the same for a long time. In principle, silver oxide batteries are only produced as button cells.

Zinc-air button cells

Color-coded zinc-air batteries

Zinc-air batteries have a very high energy density. They are externally recognizable by the mostly colored sealing sticker, which keeps the air required for the chemical process away from the battery until it is activated. The almost horizontal discharge curve, which only drops steeply towards the end of the capacity, and the comparatively high current output should be emphasized. These cells are mainly used as hearing aid batteries .

Mercury button cells

M R9 is a mercury button cell with a diameter of 16 mm and a height of 6.2 mm. In the past, these batteries were mainly used in cameras . The advantage of the mercury button cell is that, in addition to more than twice the energy density compared to alkaline button cells, it offers an almost constant voltage of 1.35 V over a wide discharge range. In the first cameras with electronic circuits, for example for exposure measurement, the circuit complexity was lower because there was no additional voltage stabilization required.

In the mercury button cell, the poisonous and eponymous mercury oxide is used on the positive cathode . As a result, mercury button cells are no longer allowed to be placed on the market in the EU under the RoHS guidelines . Similar rules also apply in other regions. When switching to button cells based on zinc-air, alkali-manganese or silver oxide, it is necessary to check in each individual case whether they are suitable due to the different voltages and different discharge properties.

Overview of size and battery types of button cells

This article or section needs to be revised:

IEC 61960 standard battery nomenclature

• The table needs to be completed / checked, which is unfortunately difficult. Battery types that are not available from a manufacturer should be marked with a "-" to distinguish them from cells that have not yet been filled.
  Please help to improve it , and then remove this flag.

The names of various button cells are specified in the European standard EN 60086 . However, there are still popular names from the respective manufacturers.

Explanation of the comparison table:

• Columns “Diameter” and “Height”: Most button cells are only manufactured with an accuracy of tenths, not hundredths of a millimeter. This is absolutely standard-compliant, as only maximum values ​​are coded in the IEC designation. An SR11 30 must not be higher than a rounded 3.0 millimeters. According to the technical drawing, the manufacturer Renata produces this type with a nominal height of "3.05 mm + 0 / -0.25 mm". On its website, however, the manufacturer states a height of "3.1 mm". Since this contradicts the IEC designation, such information is only given in brackets in the table. At Varta, a fluctuation range of up to 0.4 mm is indicated for some models, for example the V 303 MF (SR1154) : diameter from 11.25 to 11.60 mm, height from 5.0 to 5.4 mm.
• "Current carrying capacity" column: (see also the section on areas of application / distinction ) In the IEC designations, the combination of both electrode materials is coded, but not the type of electrolyte. For a producer, on the other hand, it is crucial whether, for example, a potash or a caustic soda is used in a cell. Accordingly, there are two manufacturer names for some IEC types - especially those with silver oxide (SR) - one for the low-drain and one for the high-drain version.
  • LD = low drain, lower current carrying capacity, NaOH electrolyte (caustic soda)
  • HD = high drain, higher current carrying capacity, KOH electrolyte (potassium hydroxide)
• Column IEC 60086: The first letter of the type designation codes the type of internal structure of the battery (see section Voltage ). The second codes the design - for button cells there is always an R for "round", ie cylindrical shape. The numbers behind the letters are responsible for the size of the batteries. The revision of the IEC-60086 standard resulted in extensive changes:
  • With the digits of the old type designations (left column) there was no connection between type number and cell size. Standard sizes were specified or included in the standard and simply numbered.
  • When revised in October 1990 (right column), the numbers of the type designation result from the maximum values for the (rounded) standard diameter in millimeters and the exact height in tenths of a millimeter. (This definition applies to cells with a diameter and height of less than 100 millimeters.)
• The table also lists type designations that a manufacturer "currently" no longer produces, but which, due to the old widespread use, can still be found on packaging from other manufacturers, for example. For example, Maxell “currently” no longer manufactures the SR48 (IEC) itself; their designation SR754W or SR754WSW is still common.

Overview of parameters and type designations of button cells

Characteristic values					Standard / Norm			Manufacturer
					IEC 60086			Europe		United States		Asia (mostly Japan, except GP)
ø [mm]	Height [mm]	U rated [V]	Current carrying capacity	C [mAh]	until Oct. 1990	from Oct. 1990	JIS	Varta	Renata	Duracell	Bulova	Maxell	Seiko	Citizen	Panasonic	GP
04.8	1.6	1.55	LD	8 - 9	-	SR416		V337MF	337	-		SR416SW
05.8	1.2	1.55	LD	5 - 6	-	SR512		V335MF	335	-	622	SR512SW	SB-AB	280-68
	1.6	1.55	LD	10 - 12	SR62	SR516		V317MF	317	-	616	SR516SW		280-58		GP317
	2.1 (2.15)	1.5	-	10	LR63	LR521	AG0		-	-
		1.55		14th	SR63	SR521		V379MF	379	D379	618	SR521SW	SB-AC	280-59		GP379
	2.7	1.55	LD	16-21	SR64	SR527		V319MF	319	-	615	SR527SW	SB-AE / DE	280-60	-
	3.6	1.40 / 1.45		90-105	PR70	PR536		P10 V10AT V230A	10 ZA10	DA10		-			PR10 PR230 PR536	GPV10D6
06.8	1.4	1.55	LD	11-12	-	SR614		V339MF	339	-		SR614SW
	1.6	1.55	LD	14-16	SR65	LR616		V321MF	321	D321	611	SR616SW	SB-AF	280-73		GP321
	2.1 (2.15)	1.5	-	14th	LR60	LR621	AG1			-
		1.55	LD	15-20	SR60	SR621	SG1	V364MF	364	D364	602	SR621SW	SB-AG / DG	280-34
		1.55	HD	18th	SR60	SR621		-	-	-	-	SR621W	-	280-70
	2.6	1.5	-	20th	LR66	LR626	AG4			-
		1.55	LD	21-30	SR66	SR626	SG4	V377MF	377	D377	606	SR626SW	SB-AW	280-39	SR626
		1.55	HD	27-28	SR66	SR626		-	376	-	619	SR626W	SB-BW	280-72
		1.65	HD	16	ZR66	ZR626		V377ZR		-
07.9	1.2	1.55	LD	9-10	-	SR712		V346MF	346	-	628	SR712SW	SB-AH	280-66
	1.6	1.55	LD	20-23	SR67	SR716		V315MF	315	-	614	SR716SW	SB-AT	280-56
	2.1	1.5	-		LR58	LR721	AG11			-
		1.55	LD	21-25	SR58	SR721		V362MF	362	D362	601	SR721SW	SB-AK	280-29
		1.55	HD	18-25	SR58	SR721	SG11	V361MF	361	-		SR721W	SB-BK	280-53
	2.6	1.5	-	25th	LR59	LR726	AG2			-
		1.55	LD	23 - 32	SR59	SR726	SG2	V397MF	397	D397	607	SR726SW	SB-AL	280-28		GP397
		1.55	HD	25-32	SR59	SR726	SG2	V396MF	396	D396	612	SR726W	SB-BL	280-52		GP96 GP396
	3.1	1.55		36	-	SR731		V329MF	329	D329		SR731SW				GP29
	3.6	1.40 / 1.45		160-170	PR41	PR736		V312AT	312 ZA312	DA 312					PR312	GPV312D6
		1.5	-	28	LR41	LR736	AG3	V3GA		-						GP192
		1.55	LD	38	SR41	SR736	SG3	V384MF	384	D384	247	SR41SW	SB-A1 / D1	280-18
		1.55	HD	38	SR41	SR736	SG3	V392MF	392	D392	247B	SR41W	SB-B1	280-13
	5.4	1.40 / 1.45		290-300	PR48	PR754		P13 V13AT	13 ZA13	DA 13					PR13	GPV13D6
		1.5	-		LR48	LR754	AG5			-
		1.55	LD	80	SR48	SR754	SG5	V309MF	309	-	-	SR754SW			-
		1.55	HD	65-80	SR48	SR754	SG5	V393MF	393	D393	255	SR754W	SB-B3		-
09.5	1.6	1.55	LD	26-29	SR68	SR916		V373MF	373	-	617	SR916SW	SB-AJ	280-45
		1.55	HD		SR68	SR916		-	-	-		SR916W		280-61
	2.1 (2.05) (2.15)	1.55	LD	35-45	SR69	SR921	SG6	V371MF	371	D371	605	SR920SW	SB-AN	280-31		GP371
		1.55	HD	39-40	SR69	SR921		V370MF	370	-	620	SR920W	SB-BN	280-51		GP370
		1.5	-	30th	LR69	LR921	AG6
	2.6	1.5	-	34 - 45	LR57	LR926	AG7		195							GP95A
	2.7	1.55	LD	55	SR57	SR927	SG7	V395MF	395	D395	610	SR927SW	SB-AP / DP	280-48		GP395
		1.55	HD	40 - 42	SR57	SR927	SG7	V399MF	399	D399	613	SR927W	SB-BP / EP	280-44		GP399
		3.0		30th	CR57	CR927				-
	3.6	1.5	-		LR45	LR936	AG9			-
		1.55		67	SR45	SR936	SG9	V394MF	394	D394	625	SR936W	SB-A
10.0	2.5	3.0		30-32	-	CR1025			CR1025	-		CR1025			CR1025EL
11.6	1.6	1.55	LD	47-50	-	SR1116		-	366	-	608	SR1116SW		280-46
		1.55	HD	47	-	SR1116		-	365	-		SR1116W
	2.0 (2.05)	1.5	-	40	-	LR1120	(AG8)	V8GA		-						GP191
		1.55	LD	49-50	-	SR1120	SG8	V381MF	381	-	317	SR1120SW	SB-AS	280-27		GP381
		1.55	HD	42-55	-	SR1120	SG8	V391MF	391	D391	609	SR1120W	SB-BS / ES	280-30		GP391
	2.1 (2.05)	1.5	-	40	LR55	LR1121	AG8	V8GA		-						GP191
		1.55	LD	49-50	SR55	SR1121	SG8	V381MF	381	-	317	SR1121SW	SB-AS	280-27		GP381
		1.55	HD	42-55	SR55	SR1121	SG8	V391MF	391	D391	609	SR1121W	SB-BS / ES	280-30		GP391
	2.6				? R56 1	? R1126				-
	3.0 (3.05) (3.1)	1.5	-	75	LR54	LR1130	AG10	V10GA	-	LR54			L1131		LR1130	GP189
		1.55	LD	59-83	SR54	SR1130	SG10	V390MF	390	D390	603	SR1130SW	SB-AU	280-24
		1.55	HD	79-81	SR54	SR1130	SG10	V389MF	389	D389	626	SR1130W	SB-BU	280-15
	3.6	1.55	HD	100-105	SR42	SR1136		V350MF	350	D350		SR1136W
	4.2 (4.1)	1.5	-	100	LR43	LR1142	AG12	V12GA	-	LR43						GP186
		1.55	LD	082-125	SR43	SR1142	SG12	V301MF	301	-		SR43SW	SB-A8	280-01
		1.55	HD	105-125	SR43	SR1142		V386MF	386	D386		SR43W	SB-B8	280-41
	5.4	1.40 / 1.45		605-660	PR44	PR1154		P675 V675AT HA675A	675 ZA675	DA 675					PR675
		1.5	-	120-145	LR44	LR1154	AG13	V13GA	LR44	PX76A					LR44EL	GPA76
		1.55	LD	130	SR44	SR1154	SG13	V303MF	303	-		SR44SW	SB-A9	280-08		GP303
		1.55	HD	130-155	SR44	SR1154	SG13	V357MF V76PX	357	D357H	228	SR44W	SB-B9	280-62		GP357
12.5	1.6	3.0		25th	-	CR1216		CR1216	CR1216	-					CR1216EL
	2.0	3.0		35	-	CR1220		CR1220	CR1220	DL1220					CR1220EL
	2.5	3.0		38	-	CR1225		CR1225	CR1225	-
		3.0		48	-	BR1225				-					BR1225
16.0	1.6	3.0		55	-	CR1616		CR1616	CR1616	DL1616		CR1616		280-209	CR1616EL
	2.0	3.0		75	-	CR1620		CR1620	CR1620	DL1620					CR1620EL
	3.2	3.0		125-140	-	CR1632		CR1632	CR1632	-					CR1632EL
	6.2	1.35		450	MR9	MR1662		V625PX		-					MR-9
		1.5		200	LR9	LR1662		V625U		PX625A
16.4	11.4	1.35			MR52	MR16114				-
		1.5			LR52	LR16114				-
20.0	1.2	3.0		55	-	CR2012				-					CR2012EL
	1.6	3.0		75-90	-	CR2016		CR2016	CR2016	DL2016		CR2016		280-206	CR2016EL
	2.5	3.0		150-165	-	CR2025		CR2025	CR2025	DL2025		CR2025			CR2025EL
	3.2	3.0		200	-	BR2032				-					BR2032
		3.0		210-230	-	CR2032		CR2032	CR2032	DL2032		CR2032	SB-T 51		CR2032EL
23.0	2.0	3.0		130	-	CR2320		CR2320	CR2320	DL2320
	2.5	3.0		165	-	BR2325				-					BR2325
		3.0		190	-	CR2325			CR2325	-
	3.0	3.0		255	-	BR2330				-					BR2330
		3.0		265	-	CR2330				-					CR2330
	5.4	3.0		560	-	CR2354				-					CR2354EL
	6.1	1.5		350	LR53	LR2361		V825PX		-
24.5	3.0	3.0		280	-	CR2430		CR2430	CR2430	DL2430					CR2430EL
	5.0	3.0		560-620	-	CR2450		CR2450	CR2450N	DL2450					CR2450EL
	7.7	3.0		950-1000	-	CR2477			CR2477N	-					CR2477
30.0	3.2	3.0		500	-	BR3032				-					BR3032

¹ According to IEC 60086-1, the size R56 is intended, but no cell actually manufactured in this size has been found (on the Internet).

Rechargeable button cells

Aged 1.2 volt button cell battery with green protective cover (right) on a printed circuit board

Button cells are also available as rechargeable batteries ( accumulators for short) that are used in computers, laptops, cordless telephones, headphones, hearing aids, etc. The nominal voltage of nickel-cadmium batteries or nickel-metal hydride batteries is 1.2  volts . In Germany, nickel-cadmium button cells are now banned by the Battery Act and have therefore completely disappeared from the market.

In a few cases, rechargeable lithium-ion batteries are also used in watches. Rechargeable button cells are named similarly to non-rechargeable cells. So have z. B. the button cells CR2032 and the rechargeable LIR2032 have the same dimensions. The cell voltage of the rechargeable "LIR" variant is 3.6  volts, which is 20% higher than that of the "CR" disposable variant, so they cannot easily be exchanged for one another.

Panasonic lithium-ion battery models

designation	tension	Diameter O	height
MT-516	1.5V	5.8 mm	1.6 mm
MT-621	1.5V	6.8 mm	2.1 mm
MT-920	1.5V	9.5 mm	2.0 mm

Button cells and toddlers

Like all small parts, button cells should be kept safe from children. Tissue damage can occur if the patient remains in the esophagus or stomach for a long time, which rarely occurs. “If button cells are swallowed, the button cells can get stuck in the esophagus and seriously damage the mucous membrane. The "Assessment of Poisoning" commission of the Federal Institute for Risk Assessment (BfR) therefore advises particular caution. "

Web links

Commons : Button cell  - collection of pictures, videos and audio files

• Foundation for a joint take-back system for batteries

Individual evidence

1. ↑ DIN EN 61951-1
2. ↑ Hans-Martin Hanisch: ABCDE battery technologies . In: abcde.de . Allgäu Button Cells Direct & Electronics. January 24, 2004. Archived from the original on February 14, 2013.
3. ↑ Best Practice Municipal Waste Management SWSM-05_ACU (PDF) In: Umweltbundesamt.de . June 6, 2004.
4. ↑ Press release: Parliament votes for a ban on cadmium in batteries for power tools . In: europa.eu . October 10th, 2013.
5. ↑ IEC 60086-1 ( English , PDF, 525 kB) In: instrument.com.cn . IEC Central Office GENEVA, SWITZERLAND. S. December 27, 2006. Archived from the original on March 15, 2017 .: “Designation system in use up to October 1990; Table C.1 - Physical designation and dimensions of round cells and batteries "
6. ↑ Renata Hearing Aid Batteries (Zinc Air) 1.45V ( English ) In: renata.com . Renata SA.
7. ↑ Data sheet Varta button cell V377ZR / ZR66 / ZR626 ( English , PDF) In: varta-microbattery.com . Archived from the original on May 31, 2013.
8. ↑ Directive 2013/56 / EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of November 20, 2013 amending Directive 2006/66 / EC (PDF)
9. ↑ SR1130SW - Technical Data Sheet ( English , PDF) In: renata.com . Renata SA. August 15, 2019. Retrieved May 25, 2020.
10. ↑ Silver Oxide 0% Mercury Batteries ( English ) In: renata.com . Renata SA. 2018.
11. ↑ VARTA V 303 MF - Data Sheet ( English , PDF) In: varta-microbattery.com . Archived from the original on May 31, 2013.
12. ↑ IEC 60086-1 ( English , PDF, 525 kB) In: instrument.com.cn . IEC Central Office GENEVA, SWITZERLAND. P. 30 ff. December 2006. Archived from the original on March 15, 2017 .: “Designation system in use since October 1990; Figure C.1 - Designation system for round batteries: Ø <100 mm; height A <100 mm "
13. ↑ MICRO BATTERY Cross Reference and Replacement Guide ( English , PDF, 44 kB) In: maxell.com . Hitachi Maxell, Ltd. December 2009. NOTE: In addition to high and low drain , Maxell also specifies the general application area . This usually includes types with potassium hydroxide, i.e. high-drain.
14. ↑ ^{a b} BATTERY CATALOG 2015 ( English , PDF, 5.7 MB) In: panasonic-batteries.com . Panasonic Corporation. Pp. 46-50. March 2nd, 2015. Archived from the original on May 19th, 2017. (NOTE: The Panasonic print catalog contains the correct information, the Panasonic website, on the other hand, contains partially incorrect information, e.g. PR675 (height 5.4mm vs.))
15. ↑ Silver Oxide Battery CROSS-REFERENCE CHART ( English ) In: sii.co.jp . Seiko Instruments Inc ..
16. ↑ Comparison lists and information for button cells and batteries (PDF, 546 kB) In: accu3000.de . Ralf Hottmayer. June 12, 2014.
17. ↑ Erich Käser: Comparison table button cells button cells . In: fachlexika.de . Specialized lexicon of mechatronics. 2010. Accessed in 2010. (ATTENTION: partly incorrect, e.g. Renata 364 (SR60) is a LowDrain but is specified with SR621W instead of SR621SW)
18. ↑ POWERFUL SPECIAL BATTERIES FOR EVERY ENERGY NEED . In: varta-consumer.de . VARTA Consumer Batteries GmbH & Co. KGaA. (Professional Special Batteries - battery names / specifications)
19. ↑ Varta photo batteries: The triggering force. (PDF, 240 kB) In: conrad.com . Varta Battery AG. December 21, 1999. Archived from the original on March 15, 2017. (List of historical cell types, some still containing mercury)
20. ↑ Industrial Products Overview (bulk packed) ( English ) In: renata.com . Renata SA.
21. ↑ Consumer Product Overview - Chemical Systems (Blister Packaging) ( English ) In: renata.com . Renata SA.
22. ↑ Button cell comparison list - button cell batteries for watches, photos, hearing aids (comparison lists) . In: akkuline.de . Akkuline Shop.
23. ↑ Primary Batteries ( English ) In: maxell.com . Maxell Ltd ..
24. ↑ Industrial Devices & Solutions ( English ) In: panasonic.com . Panasonic Corporation.
25. ↑ PowerStream Li-ion Coin Cell Lir2032 Data Sheet ( English , PDF) In: powerstream.com . Lund Instrument Engineering. June 6, 2004.
26. ↑ [ Dönges ]: Pressure-sensitive protective layer: Less danger from swallowed batteries . In: Spektrum.de . 3rd November 2014.
27. ↑ ^{a b} Button cells: Swallowing can cause serious damage to the health of small children . In: bund.de . 23rd November 2018.