Standard NiMH batteries have a wide tolerance range.  
Length Width
Rechargable Min Max Min Max
AA-Rechargable 47.3 50.5 13.5 14.5
C-Rechargable 48.5 50.0 24.9 26.2
D-Rechargable 59.5 61.5 32.2 34.2
Dimensions shown are mm
IEC-ANSI standards 
Battery Specifications, cross referenece & dimensions, ANSI, NEDA, IEC 
PDF's of Batteries:
AAA rechargable Battery
AA Rechargable Battery
C Size Rechargable Battery
D size Rechargable Battery
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AAA-NiMH
ELECTROCHEMICAL SYSTEM:                    NICKLE-METAL HYDRIDE
NOMINAL VOLTAGE:                                   1.2
MAXIMUM OFF-LOAD VOLTAGE:                 1.5
RATED CAPACITY:                                      750mAh to 1.0V at 20°C (68°F)
AVERAGE WEIGHT:                                    0.4 oz (12.0 g)
OPERATING TEMP. RANGE:                       CHARGE:0°C to 50°C (32°F to 122°F),
                                                                  DISCHARGE: -20°C to 50°C (-4°F to 122°F)
ANSI DESIGNATION:                                   1.2H1
EVEREADY NEDA OTHER
NH12 1.2H1 GP65AAAH


AA-NiMH
ELECTROCHEMICAL SYSTEM:                    NICKLE-METAL HYDRIDE
NOMINAL VOLTAGE:                                   1.2
MAXIMUM OFF-LOAD VOLTAGE:                 1.5
RATED CAPACITY:                                      1.7Ah to 1.0V at 20°C (68°F)
AVERAGE WEIGHT:                                    1.0 oz (27 g)
OPERATING TEMP. RANGE:                       CHARGE:0°C to 50°C (32°F to 122°F),
                                                                  DISCHARGE:-20°C to 50°C (-4°F to 122°F)
ANSI DESIGNATION:                                   1.2H2
EVEREADY NEDA OTHER
NH15 1.2H2 GP150AAM


C-NiMH
ELECTROCHEMICAL SYSTEM:                    NICKLE-METAL HYDRIDE
NOMINAL VOLTAGE:                                    1.2
MAXIMUM OFF-LOAD VOLTAGE:                  1.5
RATED CAPACITY:                                       2.2Ah to 1.0V at 21°C (70°F)
AVERAGE WEIGHT:                                     2.1 oz (60 g)
OPERATING TEMP. RANGE:                        CHARGE:0°C to 50°C (32°F to 122°F), 
                                                                   DISCHARGE:-20°C to 50°C (-4°F to 122°F)
ANSI DESIGNATION:                                    1.2H3
EVEREADY NEDA
NH35 1.2H3



D-NiMH
ELECTROCHEMICAL SYSTEM:                    NICKLE-METAL HYDRIDE

NOMINAL VOLTAGE:                                    1.2

MAXIMUM OFF-LOAD VOLTAGE:                  1.5
RATED CAPACITY:                                       2.2Ah to 1.0V at 21°C (70°F)

AVERAGE WEIGHT:                                     2.6 oz (73.0 g)

OPERATING TEMP. RANGE:                         CHARGE:0°C to 50°C (32°F to 122°F),
                                                                    DISCHARGE:-20°C to 50°C (-4°F to 122°F)
ANSI DESIGNATION:                                     1.2H4
EVEREADY NEDA
NH50 1.2H4