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Knowledge Base : Tools : List of Common Battery Case Sizes by BCI Group Number

List of Common Battery Case Sizes by BCI Group Number

Are you looking for a marine, RV, automotive, or solar PV battery? You may have heard common terms like a "group 24 battery" or "type 27 marine battery". These numbers are referring to the BCI Group Number of the battery. These numbers define the physical dimensions of the battery case. This is important as some applications call for specific case sizes. The BCI does not determine the Amp Hours (AH) rating for the batteries, however, but there is a correlation between case size and AH rating. For deep cycle batteries, the larger the case size the more capacity the battery will usually have. For more information about Amp Hours and how it relates to battery capacity, read here. To calculate how much reserve power you need, and thus which battery to use, check out our calculator.

12 Volt Starting Batteries by BCI Group Number

BCI GROUP NUMBER DIMENSIONS IN INCHES* Amp Hours (AH) CCA THUMBNAIL
Length Width Height

25

BatteryStuff Part #: OPT-25

9.94"
6.81" 7.63" 44
720 25

34

BatteryStuff Part #: OPT-34

10" 6.88"
7.63"
50
800 34

34M

BatteryStuff Part #: OPT-34M

10" 6.88"
7.94"
50
800 34M

34R

BatteryStuff Part #: OPT-34R

10" 6.88"
7.63"
50
800 34R

34/78

BatteryStuff Part #: OPT-34/78

10" 6.88"
7.63"
50
800 34/78

35

BatteryStuff Part #: OPT-35

9.31" 6.82"
7.82"
44
720 35

75/25

BatteryStuff Part #: OPT-75/25

9.31" 6.82"
7.82"
44
720 75/25

12 Volt Deep Cycle Batteries by BCI Group Number

BCI GROUP NUMBER DIMENSIONS IN INCHES* Amp Hours (AH) THUMBNAIL
Length Width Height

U1

BatteryStuff Part #: 8AU1H

8.31" 5.13" 7.25" 32 U1

22NF

BatteryStuff Part #: 8A22NF

9.38" 5.50" 9.25" 55 22NF

24

BatteryStuff Part #: 8A24

10.25"
6.75" 9.88" 79
24

27

BatteryStuff Part #: 8A27

12.75" 6.88"
9.88" 92 27

30H

BatteryStuff Part #: UB121100-40603

13" 6.8"
9.5"
110
31

31

BatteryStuff Part #: 31HR4000S

12.93" 6.75"
8.74"
105
31

4D

BatteryStuff Part #: 8A4D

20.75" 8.50"
11"
200
4D

8D

BatteryStuff Part #: 8A8D

20.75" 11"
11"
245
8D

6 Volt Deep Cycle Batteries by BCI Group Number

BCI GROUP NUMBER DIMENSIONS IN INCHES* Amp Hours (AH) THUMBNAIL
Length Width Height

GC2

BatteryStuff Part #: 8AGC2

12.25" 7.13"
12.88"
200
GC2

 

* Dimensions are generally taken at the widest point on the battery. The length and width are usually longest at the top of the battery, narrowing slightly at the base. The total height includes the terminal posts.


 
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