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Knowledge Base : Tools : BCI Battery Group Size Chart

BCI Battery Group Size Chart

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." Then our battery group size chart below may come in handy to help you find the right deep cycle battery. These numbers are referring to the Battery Council International, or 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.

While the BCI does not determine the Amp Hours (AH) rating for the batteries, 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, find out how it relates to battery capacity. To calculate how much reserve power you need, and thus which battery to use, check out our Calculator for Sizing a 12 Volt Battery to a Load.

Battery Group Size Chart for 12 Volt Deep Cycle RV & Marine batteries

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

U1

CSB Battery #: EVH12390 (AGM)
Universal Battery #: UB12350-D5722 (AGM)
MK Battery #: 8GU1 (GEL)
MK Battery #: MU-1 SLD G (GEL)

7.71" 5.18" 6.89" 31 - 39 CSB 12v 39 AH Deep Cycle AGM Battery

22NF

Universal Battery #: UB12550-45825 (AGM)
MK Battery #: 8A22NF (AGM)
MK Battery #: 8G22NF (GEL)
Univesal Battery #: UB22NFGEL (GEL)

9.01" 5.43" 9.00" 55 22NF

24

MK Battery #: 8A24 (AGM)
Universal Battery #: UB12750-45821 (AGM)
MK Battery #:8G24 (GEL)
Universal Battery #:UB24GEL-D5872 (GEL)

11.13"
6.60" 9.25" 80
Picture of an MK 8A24 Battery

27

Universal Battery #: UB12900-45826 (AGM)
MK Battery #: 8A27 (AGM)
Universal Battery #: UB27 (GEL)
MK Battery #: 8G27 (GEL)

12.00" 6.63"
9.06" 90 27

30H

Universal Battery #: UB121100-D5751
Universal Battery #: UB30H (GEL)

13" 6.8"
9.5"
110
31

31

MK Battery #: 8A31DT (AGM)
MK Battery #: E31 SLD G (GEL)

12.9" 6.75"
9.27"
125
Picture of a MK Battery 8A31DT

4D

Universal Battery #: UB4D-45965 (AGM)
MK Battery #: 8A4DLTP (GEL)
Universal Battery #: UB-4D-40701 (GEL)
MK Battery #: 8G4DLTP (GEL)

20.5" 8.13"
10"
200
Picture of a Universal 4D Battery

8D

MK Battery #: 8A8DLTP (AGM)
Universal Battery #: UB8D-45964 (AGM)
Universal Battery #: UB-8D-40702 (GEL)
MK Battery #: 8G8DLTP (GEL)

20.75" 11"
11"
245
8D

Battery Group Size Chart for 6v Deep Cycle batteries

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

GC2

Universal Battery #: UBGC2 (AGM)
MK Battery #: 8AGC2 (AGM)
MK Battery #: 8GGC2 (GEL)

10.38" 7.13"
10.88"
225
GC2

L16

Lifeline Battery #: GPL-L16T (AGM)
Universal Battery #: UB63800-40870 (AGM)

11.64" 6.95"
15.73"
400
8D

Battery Group Size Chart for 2v Deep Cycle batteries

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

L16

Lifeline Battery #: GPL-L16T-2V (AGM)

10.38" 7.13"
10.88"
225
GC2

Battery Group Size Chart for 12v Starting batteries

BCI GROUP NUMBER APPROXIMATE 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

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2 people commented, Tech, Joe Cross
This article is rated 5.0 out of 5
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  • Joe Cross
    Looking for a good battery for a pontoon boat with a 50hp. Moter something I don’t have to keep charging all the time what do recommend thanks

    Reply  •  Rated article 5  •  May 18, 2020 at 2:11 pm
    • BatteryStuff Tech
      Our best recommendation is to follow the manufacturers recommendation for your motor. If you are unaware of their recommendation I would suggest contacting them directly. Using the wrong battery can cause issues, so it is always best to go with their recommendation.

      Reply  •  Rated article 5  •  May 19, 2020 at 9:28 am



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