Battery Group Size Chart [All Notes In One Place!]

Hi, I'm Luis Johnson, an automobile technician, and power equipment professional. By profession, I'm a businessman and operate a car workshop. I have created this...Read more

Every journey matters with your vehicle so that the batteries that power them up remain in top condition. Here comes the importance of correct battery size, as it is a must for the perfect performance of the vehicles. The battery group size chart plays the most crucial in assisting vehicle ownership.

BCI, or Battery Council International, sets the standard for battery weights, dimensions & testing procedures. The EN & DIN cross reference chart also assigns battery group size. Knowing the exact battery group size helps to find the new battery for replacement.

But just knowing the group size is not enough. There are many more things that you should know about this matter. That is why we recommend you stay to see every nook & corner of the matter.

Most Common Battery Group Size Chart [A Quick Review]

Battery Group Size Chart [All Notes In One Place!]

As you know, as the batteries’ size differs based on the various types of vehicles, knowing the correct battery size is crucial. This is because the wrong one won’t be able to recharge with your vehicle’s alternator.

That’s why the chart of BCI’s most common battery group size is below for a quick review.

Group Size Batteries Millimeters Centimeters Inches
L W H L W H L W H
Group 24 260 173 225 26  17.3 22.5 10.25 6.8125 8.875
Group 27 306 173 225 30.6 17.3 22.5 12.0625 6.8125 8.875
Group 31 330 173 240 33 17.3 24 13 6.8125 9.4375
Group 34 260 173 200 26 17.3  20 10.25 6.8125 7.875
Group 35 230 175 225 23 17.5 22.5 9.0625 6.875 8.875
Group 51 & 51R 238 129 223 23.8 12.9 22.3 9.374 5.0625 8.8125
Group 65 306 190 192 30.6 19 19.2 12.0625 7.5 7.5625
Group 78 260 179 196 26 17.9 19.6 10.25 7.0625  7.6875

BCI Battery Group Size Chart [Every Pinpoint]

BCI is the most common system for classifying the different types of batteries. The chart below highlights all the battery groups of BCI associated with their specification.

Passenger Car & Light Commercial Batteries [12 Volt & 6 Cells]

BCI Group Size Battery Inches Millimeters
L W H L W H
21 8 3/16 6 13/16 8 3/4 208 173 222
21R 8 3/16 6 13/16 8 3/4 208 173 222
22F 9 1/2 6 7/8 8 5/16 241 175 211
22HF 9 1/2 6 7/8 9 241 175 229
22NF 9 7/16 5 1/2 8 15/16 240 140 227
22R 9 6 7/8 8 5/16 229 175 211
24 10 1/4 6 13/16 8 7/8 260 173 225
24F 10 3/4 6 13/16 9 273 173 229
24H 10 1/4 6 13/16 9 3/8 260 173 238
24R 10 1/4 6 13/16 9 260 173 229
24T 10 1/4 6 13/16 9 3/4 260 173 248
25 9 1/16 6 7/8 8 7/8 230 175 225
26 8 3/16 6 13/16 7 3/4 208 173 197
26R 8 3/16 6 13/16 7 3/4 208 173 197
27 12 1/16 6 13/16 8 7/8 306 173 225
27F 12 1/2 6 13/16 8 15/16 318 173 227
27H 11 3/4 6 13/16 9 1/4 298 173 235
29NF 13 5 1/2 8 15/16 330 140 227
33 13 5/16 6 13/16 9 3/8 338 173 238
34 10 1/4 6 13/16 7 7/8 260 173 200
34R 10 1/4 6 13/16 7 7/8 260 173 200
35 9 1/16 6 7/8 8 7/8 230 175 225
36R 10 3/8 7 1/4 8 1/8 263 183 206
40R 11 6 15/16 6 15/16 278 175 175
41 11 9/16 6 15/16 6 15/16 293 175 175
42 9 9/16 6 15/16 6 15/16 242 175 175
43 13 1/8 6 7/8 8 1/16 334 175 205
45 9 7/16 5 1/2 8 15/16 240 140 227
46 10 3/4 6 13/16 9 273 173 229
47 9 11/16 6 7/8 7 1/2 246 175 190
48 12 1/16 6 7/8 7 9/16 306 175 192
49 15 6 7/8 7 3/16 381 175 192
50 13 1/2 5 10 343 127 254
51 9 3/8 5 1/16 8 13/16 238 129 223
51R 9 3/8 5 1/16 8 13/16 238 129 223
52 7 5/16 5 13/16 8 1/4 186 147 210
53 13 4 11/16 8 1/4 330 119 210
54 7 5/16 6 1/16 8 3/8 186 154 212
55 8 5/8 6 1/16 8 3/8 218 154 212
56 10 6 1/16 8 3/8 254 154 212
57 8 1/16 7 3/16 6 15/16 205 183 177
58 10 1/16 7 3/16 6 15/16 255 183 177
58R 10 1/16 7 3/16 6 15/16 255 183 177
59 10 1/16 7 5/8 7 3/4 255 193 196
60 13 1/16 6 5/16 8 7/8 332 160 225
61 7 9/16 6 3/8 8 7/8 192 162 225
62 8 7/8 6 3/8 8 7/8 225 162 225
63 10 3/16 6 3/8 8 7/8 258 162 225
64 11 11/16 6 3/8 8 7/8 296 162 225
65 12 1/16 7 1/2 7 9/16 306 190 192
70 8 3/16 7 1/16 7 11/16 208 179 196
71 8 3/16 7 1/16 8 1/2 208 179 216
72 9 1/16 7 1/16 8 1/4 230 179 210
73 9 1/16 7 1/16 8 1/2 230 179 216
74 10 1/4 7 1/4 8 3/4 260 184 222
75 9 1/16 7 1/16 7 11/16 230 179 196
76 13 1/8 7 1/16 8 1/2 334 179 216
78 10 1/4 7 1/16 7 11/16 260 179 196
85 9 1/16 6 13/16 8 230 173 203
86 9 1/16 6 13/16 8 230 173 203
90 9 11/16 6 7/8 6 7/8 246 175 175
91 11 6 7/8 6 7/8 280 175 175
92 12 1/2 6 7/8 6 7/8 317 175 175
93 15 6 7/8 6 7/8 354 175 175
94R 12 3/8 6 7/8 7 1/2 315 175 190
95R 15 9/16 6 7/8 7 1/2 394 175 190
96R 9 1/2 6 15/16 6 15/16 242 175 175
97R 9 15/16 6 7/8 7 1/2 252 175 190
98R 11 3/16 6 7/8 7 1/2 283 175 190
99 8 1/8 6 7/8 6 7/8 207 175 175
99R 8 1/4 6 7/8 6 7/8 210 175 175
100 10 1/4 7 1/16 7 3/8 260 179 188
101 10 1/4 7 1/16 6 11/16 260 179 170
121R 8 1/4 7 8 1/2 208 177 215
124 10 7/16 6 7/8 8 7/16 265 175 214
124R 10 3/8 7 8 5/16 262 177 218
151R 7 3/8 4 15/16 8 7/8 188 125 225

Passenger Car & Light Commercial Batteries [6 Volt & 3 Cells]

BCI Group Size Battery Inches Millimeters
L W H L W H
1 9 1/8 7 1/8 9 3/8 232 181 238
2 10 3/8 7 1/8 9 3/8 264 181 238
2E 19 7/16 4 1/8 9 1/8 492 105 232
2N 10 5 9/16 8 15/16 254 141 227
17HF 7 3/8 6 7/8 9 187 175 229
19L 8 1/2 7 7 1/2 216 178 191

Heavy Duty Commercial & Special Tractor Batteries [12 Volts & 6 Cells]

BCI Group Size Batteries Inches Millimeters
L W H L W H
3EE 19 5/16 4 3/8 8 7/8 491 111 225
3ET 19 5/16 4 3/8 9 13/16 491 111 249
4D 20 3/4 8 3/4 9 7/8 527 222 250
4DLT 20 8 3/16 7 15/16 508 208 202
6D 20 3/4 10 10 1/4 527 254 260
8D 20 3/4 11 1/8 9 7/8 527 283 250
12T 7 1/16 6 15/16 7 15/16 179 177 202
28 10 5/16 6 13/16 9 7/16 261 173 240
29H 13 1/8 6 3/4 9 1/8 334 171 232
30H 13 1/2 6 13/16 9 1/4 343 173 235
31 13 6 13/16 9 7/16 330 173 240

Heavy Duty Commercial & Special Tractor Batteries [6 Volt & 3 Cells]

BCI Group Size Batteries Inches Millimeters
L W H L W H
3 11 3/4 7 1/8 9 3/8 298 181 238
3EH 19 5/16 4 3/8 9 13/16 491 111 249
4 13 1/8 7 1/8 9 3/8 334 181 238
4EH 19 5/16 5 9 13/16 491 127 249
5D 13 3/4 7 1/8 9 3/8 349 181 238
7D 16 1/4 7 1/8 9 3/8 413 181 238

Electric Vehicle Batteries [6 Volt & 3 Cells]

BCI Group Size Batteries Inches Millimeters
L W H L W H
Group GC2 10 3/8 7 3/16 10 5/8 264 183 270
Group GC2H 10 3/8 7 3/16 11 5/8 264 183 295

Electric Vehicle Batteries [8 Volt & 4 Cells]

BCI Group Size Batteries Inches Millimeters
L W H L W H
Group GC8 10 3/8 7 3/16 10 7/8 264 183 277
Group GC8H 10 3/8 7 3/16 11 5/8 264 183 295

Electric Vehicle Batteries [12 Volt & 6 Cells]

BCI Group Size Batteries Inches Millimeters
  L W H L W H
Group GC12 12 7/8 7 3/16 10 7/8 327 183 277

General Purpose Batteries [12 Volt & 6 Cells]

BCI Group Size Batteries Inches Millimeters
L W H L W H
Group U1 7 3/4 5 3/16 7 5/16 197 132 186
Group U1R 7 3/4 5 3/16 7 5/16 197 132 186
U2 6 5/16 5 3/16 7 1/8 160 132 181

Ordnance Batteries [12 Volt & 6 Cells]

BCI Group Size Batteries Inches Millimeters
L W H L W H
2H 10 1/4 5 5/16 8 15/16 260 135 227
6T 11 1/4 10 1/2 9 1/16 286 267 230

Ordnance Batteries [24 Volt & 12 Cells]

BCI Group Size Batteries Inches Millimeters
L H W L H W
4H 10 3/4 10 5/16 9 273 262 229

BCI Battery Groups With DN & EN Codes [Cross Reference Chart]

The DIN & EN are another classification system of battery groups that you may see in the vehicle’s user manual or while buying a new one. You can use the classification chart [listed below] if you are still looking for the right one.

BCI Group Millimeter Inches EN Codes DIN Codes
L H W L H W  
99R 210 175 175 8 1/4 6 7/8 6 7/8 36LB T4, LB1
99 207 175 175 8 1/8 6 7/8 6 7/8 36LB T4, LB1
98R 283 175 190 11 3/16 6 7/8 7 1/2 66L3 H6, L3
97R 252 175 190 9 15/16 6 7/8 7 1/2 55L2 H5, L2
95R 394 175 190 15 9/16 6 7/8 7 1/2 H9, L6
94R 315 175 190 12 3/8 6 7/8 7 1/2 77L4 H7, L4
93 354 175 175 15 6 7/8 6 7/8 88LB T8, LB5
92 315 175 175 12 1/2 6 7/8 6 7/8 77LB T7, LB4
91 278 175 175 11 6 7/8 6 7/8 66LB T6, LB3
90 242 175 175 9 11/16 6 7/8 6 7/8 45LB T5, LB2
49 354 175 190 15 6 7/8 7 3/16 88L5 H8, L5
48 278 175 190 12 1/16 6 7/8 7 9/16 66L3 H6, L3
47 242 175 190 9 11/16 6 7/8 7 1/2 55L2 H5, L2
42 242 175 175 9 5/16 6 13/16 6 13/16 45LB T5, LB2
41 293 175 175 11 3/16 6 7/8 6 7/8 54LB T65
40R 278 175 175 10 15/16 6 7/8 6 7/8 66LB T6, LB3

Dimensions, Features & Recommendation Of Different Group Size Batteries

Not only are the sizes of the battery groups different, but they also differ in features & recommendations. Here are highlighted the features, dimensions & recommendations of the most common battery groups.

Batteries Of 24 Group

BCI 24 battery group is the most general-purpose battery & common for the UPS system, security & medical system & industrial appliances. They are best to be used in the float or deep application.

You must be careful when choosing a 24-battery group as the group has a slight dimension difference.

Batteries Of 24 Group

Batteries Of 27 Group

Group 27 battery is a powerful battery featuring a 20h capacity. The battery provides CCA 600-1000, RC 140-220 minutes & weight ranges between 54 & 70 pounds.

Group 27F, group 27H & group 27 are very similar battery groups. Often, they are labeled as group 27 batteries.

Batteries Of 27 Group

Get to Know the difference: Group 24 vs Group 27 Deep Cycle Battery

Batteries Of 31 Group

Group 31 batteries are relatively powerful & large batteries. The battery group is standard for marine, off-grid, automotive & similar applications. It featured with

  • CCA- 750-1250
  • 150-250 minutes
  • 20h capacity
  • 75-125 Ah range

Batteries Of 31 Group

Batteries Of 34 Group

Group 34 batteries are powerful but medium-large. It is mainly used in marine, off-the-grid applications, industrial & automotive. The battery group is featured with 20h capacity providing

  • 50-75 Ah range
  • Reserve Capacity 100-145 minutes
  • 750-900 CCA
  • 37 and 51 pounds in weight [depend on battery type]

Batteries Of 34 Group

Batteries Of 35 Group

Among the lead acid batteries, the 35 group is the most common & primarily used in trucks, RVs & cars as dual-purpose or starting batteries [more as dual purpose. The popular 35 batteries are AGM Absorbent Glass Mat or SLA Sealed Lead Acid batteries.

Batteries Of 35 Group

Batteries Of 58 & 58R Group

Group 58 & 58R batteries are mid-size cranking batteries. They are mostly used in sedans, SUVs & some passenger cars & even in boats. Both groups share almost similar dimensions.

Many brands offer some batteries of these groups that are internally different. Besides, group 58R batteries have more discharge characteristics than group 58 batteries.

Batteries Of 58 & 58R Group

Batteries Of 65 Group

Group 65 are mid-size batteries commonly used in marine, automotive & industrial batteries. The battery group is often designed as AGM batteries of dual purpose. Group 65 batteries are featured with-

  • 20h capacity with 70-75 Ah
  • 20h capacity
  • 130-150 minutes RC
  • 750-950 CCA
  • 1100 Amps MCA values
  • 45 and 55 pounds in weight

Batteries Of 65 Group

Batteries Of 78 Group

Group 78 batteries are used in cars and light trucks, as well as light industrial applications and marine starting. The battery is generally used for dual-purpose & ‘Stop-and-Go’ automotive applications. Such applications need durable and tough & high-quality batteries.

Batteries Of 78 Group

Common Battery Group Sizes By Different Vehicle Types [Choose According To Your Vehicle]

BCI groups sizes have different types, sizes & dimensions for different batteries. The battery group sizes assist you in understanding the battery sizes used in various vehicles. Here are the most common battery groups for different vehicles.

Vehicle Type Battery Groups
Passenger cars [Automotive battery groups] 24, 24F, 27, 34, 35, 65, 78, H6 [48] & H9 [49]
Bike, Motorcycles & Powersports Lead-acid motorcycle battery destination: 12N, G, C, Y, GB, YB & CB

Maintenance free motorcycle battery destination: GTX, CTX & YTX

Battery groups for light trucks 19L, 17HF, 2N, 2E, 2 & 1
Battery groups for big trucks 3 cells: 7D, 5D, 4EH, 4, 3EH & 3

 6 cells: 31, 30H, 29H, 28, 12T, 8D, 6D, 4DLT, 4D, 3ET & 3EE

Electric or Hybrid cars battery groups GC2, CG2H, GC8, GC12 & GC8H
Battery groups for Marine, boats & yachts 34, 31, 27, 8D & 4D
Battery groups for lawn mower U1, U1R & U2

What Is The Size Of The Battery For My Car?

Physical size, terminal orientation, and cranking AMP size are the three basic characteristics of the battery. The physical size [referred to in the chart] must be a perfect fit in the battery tray or terminal.

You can look at the battery label on the top of the original battery of your battery to know the group size. It will assist you in finding the physical size of the battery that your application needs.

The next thing you need to consider is your vehicle’s cranking & cold amp. You can also look at the battery label for it.

The cranking amps measured at 0 degrees Celsius or 32 degrees Fahrenheit, whereas the cold amps measured at 18 degrees Celsius or 0 degrees Fahrenheit.

If the climate of your dwelling place never goes below the 32-degree Fahrenheit, then the cranking amps should be your main concern.

You can measure the original battery tray or box to determine the size of your battery if you don’t have the application’s original battery or have lost the top label. Then you can use the group size chart of the battery to figure out the battery you need.

Frequently Asked Questions

In this subsection, we will highlight several mostly searched queries about the battery you would also like to know. Take a look for more & better knowledge.

Are Group 27 and 31 Batteries the Same Size?

The BCI 27 battery group is almost like the group 31 batteries. They have practically the same specifications & dimensions. But there can be little difference as group 27 is slightly shorter in height & length than group 31.

Does Group Size Matter on A Battery?

Yes, the group size matters on a battery. The battery’s group size is set as the standard of the battery sizes based on the model, make, and engine type.

Besides, one type of vehicle can fit more than one type of battery group. You should know the correct one that the vehicle approved as the wrong one can result in low capacity & voltage.

Which Is a Better Group 24 or 27 Battery?

The BCI 24 group battery is more known as it lasts longer than the 27 groups. Besides, the group has a lower discharge rate. Group 24 has a higher capacity than the BCI 27 battery group.

What Happens if I Use the Wrong Group-Size Battery?

You may underperform in your vehicle if you use the wrong group-size battery. Besides, wrong group size batteries used in the car can lead to significant and permanent damage.

That’s why it is always necessary to know the approved battery size of your vehicle & replace the battery with the correct one.

Which Battery Is the Most Powerful, 24 or 35?

The RC rating for the 24-battery group is higher than the 35 groups. Basically, the 24-battery group is more powerful than the battery group of 35.

Conclusion

You know, different applications call for specific battery sizes. Though the battery group size is a crucial aspect of vehicle ownership, it is often overlooked.

While replacing the battery of your applications, you should consider the BCI battery group size chart, EN, or DIN cross reference chart. Besides defining the physical dimensions of different sizes of batteries, BCI provides performance ratings & configuration diagrams.

You can visit the BCI battery Replacement Data Book to see the diagram or the full details of the batteries. I hope it will be a great help to you.

Hi, I'm Luis Johnson, an automobile technician, and power equipment professional. By profession, I'm a businessman and operate a car workshop. I have created this site Batteryquery to help people purchase the right battery for their vehicles. The reason behind creating this site is to help my customers purchase the right car battery who often purchase the wrong one due to their lack of knowledge.

More Posts

Leave a Comment