Batteries – button cell equivalents

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 Equiv Equiv Equiv Equiv Diameter
(mm)
Height
(mm)
Voltage
(V)
Capacity
(mAH)
Mass
(grams)
Silver Oxide/Alkaline
*R521 G0   379  CX521 5.8 2.1 1.5 10 0.30
*R60 G1 621 364   6.8 2.1 1.5 12 0.34
*R59 G2 726 397   7.9 2.6 1.5 23 0.50
  G3 41 392   7.9 3.6 1.5 30 0.70
*R66 G4 626 377 CX626 6.8 2.6 1.5 20 0.40
        CX721 7.9 2.1 1.5 16 0.45
*R48 G5 48 393   7.9 5.4 1.5 58 1.10
*R69 G6 920 371            
*R57 G7 927 395            
        CX921 9.5 2.1 1.5 25 0.60
        CX926 9.5 2.6 1.5 34 0.75
        CX936     1.5    
 *R55 G8 1120 391   11.6 2.1 1.5 35 0.90
  G9 936 394            
 *R54 G10 1130 389   11.6 3.1 1.5 64 1.30
 *R58 G11 721 362            
 *R43 G12 LR43 386   11.6 4.2 1.5 110 1.80
 *R44 G13 LR44 357   11.6 5.4 1.5 150 2.70
IEC 60086-3 see http://en.wikipedia.org/wiki/Watch_battery for more info about voltages
*R1220         12.5 2.0 3 38  
*R1616         16.0 1.6 3 42  
*R1620         16.0 2.0 3 60  
*R2016         20.0 1.6 3 72  
*R2025         20.0 2.5 3 160  
*R2032         20.0 3.2 3 220  
*R2430         24.5 3.0 3 280  
*R2450         24.5 4.5 3 550