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 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.

12 Volt Deep Cycle RV & Marine Batteries by BCI Group Number

BCI GROUP NUMBER: U1
LifeLine Battery #: GPL-U1T (AGM)
CSB Battery #: GP12340 (AGM)
MK Battery #: 8GU1 (GEL)
Universal Battery #: U1Gel-D5870 (GEL)
DIMENSIONS IN INCHES*: 7.71" 5.18" 6.89" LxWxH
Amp Hours (AH): 32

BCI GROUP NUMBER: 22NF
Universal Battery #: UB12550-45825 (AGM)
MK Battery #: 8A22NF (AGM)
MK Battery #: 8G22NF (GEL)
Univesal Battery #: UB22NF-47605 (GEL)
DIMENSIONS IN INCHES*: 9.01" 5.43" 9.00" LxWxH
Amp Hours (AH): 55

BCI GROUP NUMBER: 24
Lifeline Battery #: GPL-24T (AGM)
Universal Battery #: UB12750-45821 (AGM)
Trojan Battery #:T24-GEL (GEL)
Universal Battery #:UB24-D5872 (GEL)
DIMENSIONS IN INCHES*: 11.13" 6.60" 9.25" LxWxH
Amp Hours (AH): 80

BCI GROUP NUMBER: 27
Universal Battery #: UB12900-45826 (AGM)
Lifeline Battery #: GPL-27T (AGM)
Universal Battery #: UB27-47608 (GEL)
Trojan Batter #: T27-GEL (GEL)
DIMENSIONS IN INCHES*: 12.00" 6.63" 9.06" LxWxH
Amp Hours (AH): 90

BCI GROUP NUMBER: 30H
BatteryStuff Part #: UB121100-D5751
DIMENSIONS IN INCHES*: 13" 6.8" 9.5" LxWxH
Amp Hours (AH): 110

BCI GROUP NUMBER: 31
Lifeline Battery #: GPL-31XT (AGM)
Lifeline Battery#: GPL-31T (AGM)
MK Battery #: E31-SLD-G (GEL)
DIMENSIONS IN INCHES*: 12.9" 6.75" 9.27" LxWxH
Amp Hours (AH): 125

BCI GROUP NUMBER: 4D
Universal Battery #: UB4DAGM-45965 (AGM)
LifeLine Battery #: GPL-4DL (AGM)
Universal Battery #: UPG4DGEL-40701 (GEL)
MK Battery #: 8G4D (GEL)
DIMENSIONS IN INCHES*: 20.5" 8.13" 10" LxWxH
Amp Hours (AH): 200

BCI GROUP NUMBER: 8D
Lifeline Battery #: GPL-8DL (AGM)
Universal Battery #: UB8D-45964 (AGM)
Universal Battery #: UB-8D-40702 (GEL)
MK Battery #: 8G8D (GEL)
DIMENSIONS IN INCHES*: 20.75" 11" 11" LxWxH
Amp Hours (AH): 245

6 Volt Deep Cycle Batteries by BCI Group Number

BCI GROUP NUMBER: GC2
Trojan Battery #: T-105 (WET)
Universal Battery #: UBGC2 (AGM)
Lifeline Battery #: GPL-4CT (AGM)
MK Battery #: 8GGC2 (GEL)
DIMENSIONS IN INCHES*: 10.38" 7.13" 10.88" LxWxH
Amp Hours (AH): 225

BCI GROUP NUMBER: L16
Lifeline Battery #: GPL-L16T (AGM)
Universal Battery #: UB63800 (AGM)
DIMENSIONS IN INCHES*: 11.64" 6.95" 15.73" LxWxH
Amp Hours (AH): 400

12 Volt Starting Batteries by BCI Group Number

BCI GROUP NUMBER: 25
BatteryStuff Part #: OPT-25
DIMENSIONS IN INCHES*: 9.94" 6.81" 7.63" LxWxH
Amp Hours (AH): 44
CCA: 720

BCI GROUP NUMBER: 34
BatteryStuff Part #: OPT-34
DIMENSIONS IN INCHES*: 10" 6.88" 7.63" LxWxH
Amp Hours (AH): 50
CCA: 800

BCI GROUP NUMBER: 34M
BatteryStuff Part #: OPT-34M
DIMENSIONS IN INCHES*: 10" 6.88" 7.94" LxWxH
Amp Hours (AH): 50
CCA: 800

BCI GROUP NUMBER: 34R
BatteryStuff Part #: OPT-34R
DIMENSIONS IN INCHES*: 10" 6.88" 7.63" LxWxH
Amp Hours (AH): 50
CCA: 800

BCI GROUP NUMBER: 34/78
BatteryStuff Part #: OPT-34/78
DIMENSIONS IN INCHES*: 10" 6.88" 7.63" LxWxH
Amp Hours (AH): 50
CCA: 800

BCI GROUP NUMBER: 35
BatteryStuff Part #: OPT-35
DIMENSIONS IN INCHES*: 9.31" 6.82" 7.82" LxWxH
Amp Hours (AH): 44
CCA: 720

BCI GROUP NUMBER: 75/25
BatteryStuff Part #: OPT-75/25
DIMENSIONS IN INCHES*: 9.31" 6.82" 7.82" LxWxH
Amp Hours (AH): 44
CCA: 720

* 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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