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.
| BCI GROUP NUMBER | APPROXIMATE DIMENSIONS IN INCHES | Amp Hours (AH) | THUMBNAIL | ||
|---|---|---|---|---|---|
| Length | Width | Height | |||
|
U1 CSB Battery #: EVH12390 (AGM) |
7.71" | 5.18" | 6.89" | 31 - 39 |  |
|
22NF Universal Battery #: UB12550-45825 (AGM) |
9.01" | 5.43" | 9.00" | 55 |  |
|
24 MK Battery #: 8A24 (AGM) |
11.13" |
6.60" | 9.25" | 80 |
 |
|
27 Universal Battery #: UB12900-45826 (AGM) |
12.00" | 6.63" |
9.06" | 90 |  |
|
30H Universal Battery #: UB121100-D5751 |
13" | 6.8" |
9.5" |
110 |
 |
|
31 |
12.9" | 6.75" |
9.27" |
125 |
 |
|
4D Universal Battery #: UB4D-45965 (AGM) |
20.5" | 8.13" |
10" |
200 |
 |
|
8D MK Battery #: 8A8DLTP (AGM) |
20.75" | 11" |
11" |
245 |
 |
| BCI GROUP NUMBER | APPROXIMATE DIMENSIONS IN INCHES | Amp Hours (AH) | THUMBNAIL | ||
|---|---|---|---|---|---|
| Length | Width | Height | |||
|
GC2 Universal Battery #: UBGC2 (AGM) |
10.38" | 7.13" |
10.88" |
225 |
 |
|
L16 Lifeline Battery #: GPL-L16T (AGM) |
11.64" | 6.95" |
15.73" |
400 |
 |
| 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 |
 |
| 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 |  |
|
34 BatteryStuff Part #: OPT-34 |
10" | 6.88" |
7.63" |
50 |
800 |  |
|
34M BatteryStuff Part #: OPT-34M |
10" | 6.88" |
7.94" |
50 |
800 |  |
|
34R BatteryStuff Part #: OPT-34R |
10" | 6.88" |
7.63" |
50 |
800 |  |
|
34/78 BatteryStuff Part #: OPT-34/78 |
10" | 6.88" |
7.63" |
50 |
800 |  |
|
35 BatteryStuff Part #: OPT-35 |
9.31" | 6.82" |
7.82" |
44 |
720 |  |
|
75/25 BatteryStuff Part #: OPT-75/25 |
9.31" | 6.82" |
7.82" |
44 |
720 |  |
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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• 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.• Rated article 5 • May 19, 2020 at 9:28 am
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