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Batteries – button cell equivalents

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This is a list of common button cells, their equivalents, physical dimensions in millimetres, nominal open-circuit voltage and their mass in grams. Please note that battery voltage and capacity depends on formulation. In the IEC battery designation system, the first letter of the battery code defines the formulation. Please see Battery formulation – IEC codes for more information. This letter is denoted by the * character in this table.

IEC Code
Equivalent 1
Equivalent 2
Equivalent 3
Equivalent 4
Diameter (mm)
Height (mm)
Voltage (volts)
Capacity (mAH)
Mass (g)
*R521
G0
 
379
 CX521
5.8
2.1
1.5
10
0.3
*R60
G1
621
364
 
6.8
2.1
1.5
12
0.34
*R59
G2
726
397
 
7.9
2.6
1.5
23
0.5
 
G3
41
392
 
7.9
3.6
1.5
30
0.7
*R66
G4
626
377
CX626
6.8
2.6
1.5
20
0.4
 
 
 
 
CX721
7.9
2.1
1.5
16
0.45
*R48
G5
48
393
 
7.9
5.4
1.5
58
1.1
*R69
G6
920
371
 
 
 
 
 
 
*R57
G7
927
395
 
 
 
 
 
 
 
 
 
 
CX921
9.5
2.1
1.5
25
0.6
 
 
 
 
CX926
9.5
2.6
1.5
34
0.75
 
 
 
 
CX936
 
 
1.5
 
 
 *R55
G8
1120
391
 
11.6
2.1
1.5
35
0.9
 
G9
936
394
 
 
 
 
 
 
 *R54
G10
1130
389
 
11.6
3.1
1.5
64
1.3
 *R58
G11
721
362
 
 
 
 
 
 
 *R43
G12
LR43
386
 
11.6
4.2
1.5
110
1.8
 *R44
G13
LR44
357
 
11.6
5.4
1.5
150
2.7
*R1220
 
 
 
 
12.5
2
3
38
 
*R1616
 
 
 
 
16
1.6
3
42
 
*R1620
 
 
 
 
16
2
3
60
 
*R2016
 
 
 
 
20
1.6
3
72
 
*R2025
 
 
 
 
20
2.5
3
160
 
*R2032
 
 
 
 
20
3.2
3
220
 
*R2430
 
 
 
 
24.5
3
3
280
 
*R2450
 
 
 
 
24.5
4.5
3
550
 

Please see http://en.wikipedia.org/wiki/Watch_battery for more info about button cell voltages. 

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