BCI Group Size: Group24 Battery VS Group 27 Battery
Introduction:
When you purchase a battery, you can usually see the dimensions the seller provides directly. However, sometimes you may encounter the term “Group Size” on the battery casing, such as Group 24 or Group 27. Do you understand the meaning of these names? If you’re feeling confused, let’s clarify this together today.
What is ‘Group Size’? Who came up with it?
BCI Group Size (Battery Council International) is a standard used to identify and categorize automotive batteries, first introduced in 1920. BCI is a nonprofit organization comprising various battery-related industry organizations, forming an industry association. The initial purpose behind introducing Group Size was to standardize market classification standards, encouraging all manufacturers, service industries, and consumers to adhere to them for accurate and efficient communication. With the market standardized, providing a specific BCI Group Size is all needed to determine a battery’s size and shape, greatly simplifying communication and ensuring accuracy.
Why is it so rare to hear the term Group Size nowadays?
As you know, it has been 103 years since the BCI Group Size 1920 was proposed in 2023. The batteries used by BCI at that time were mainly lead-acid batteries. Now, we mainly use lithium-ion batteries. You know, lithium batteries are much smaller than lead-acid batteries in size and weight, so this concept is gradually fading out of people’s sight, and people are more accustomed to describing the size directly instead of continuing to use the old BCI Size.
Complete Group Size List:
Model
Size（mm）
Size（inches）
Space（m³）
21
208 x 173 x 222
8.19 x 6.81 x 8.74
0.00389502388
21R
208 x 173 x 222
8.19 x 6.81 x 8.74
0.00389502388
22F
241 x 175 x 211
9.49 x 6.89 x 8.31
0.00483441375
22HF
241 x 175 x 229
9.49 x 6.89 x 9.02
0.00530067175
Group 22NF
240 x 140 x 227
9.45 x 5.51 x 8.94
0.00390513986
22R
229 x 175 x 211
9.02 x 6.89 x 8.31
0.00445749713
Group 24
260 x 173 x 225
10.24 x 6.81 x 8.86
0.00598696500
24F
273 x 173 x 229
10.75 x 6.81 x 9.02
0.00642073413
24H
260 x 173 x 238
10.24 x 6.81 x 9.37
0.00693144800
24R
260 x 173 x 229
10.24 x 6.81 x 9.02
0.00642073413
24T
260 x 173 x 248
10.24 x 6.81 x 9.76
0.00754501184
25
230 x 175 x 225
9.06 x 6.89 x 8.86
0.00524355450
Group 26
208 x 173 x 197
8.19 x 6.81 x 7.76
0.00353679292
Group 26R
208 x 173 x 197
8.19 x 6.81 x 7.76
0.00353679292
Group 27
306 x 173 x 225
12.05 x 6.81 x 8.86
0.00721795525
27F
318 x 173 x 227
12.52 x 6.81 x 8.94
0.00760644714
27H
298 x 173 x 235
11.73 x 6.81 x 9.25
0.00720434640
29NF
330 x 140 x 227
12.99 x 5.51 x 8.94
0.00568620726
33
338 x 173 x 238
13.31 x 6.81 x 9.37
0.00858591224
Group 34
260 x 173 x 200
10.24 x 6.81 x 7.87
0.00550277520
Group 34R
260 x 173 x 200
10.24 x 6.81 x 7.87
0.00550277520
Group 35
230 x 175 x 225
9.06 x 6.89 x 8.86
0.00524355450
36R
263 x 183 x 206
10.35 x 7.20 x 8.11
0.00561068878
40R
278 x 175 x 175
10.94 x 6.89 x 6.89
0.00441725075
41
293 x 175 x 175
11.54 x 6.89 x 6.89
0.00505510650
42
242 x 175 x 175
9.53 x 6.89 x 6.89
0.00376838087
43
334 x 175 x 205
13.15 x 6.89 x 8.07
0.00824337587
45
240 x 140 x 227
9.45 x 5.51 x 8.94
0.00390513986
46
273 x 173 x 229
10.75 x 6.81 x 9.02
0.00642073413
Group 47
242 x 175 x 190
9.53 x 6.89 x 7.48
0.00395249000
Group 48
278 x 175 x 190
10.94 x 6.89 x 7.48
0.00581518600
Group 49
354 x 175 x 190
13.94 x 6.89 x 7.48
0.00733720800
50
343 x 127 x 254
13.50 x 5.00 x 10.00
0.00854293200
Group 51
238 x 129 x 223
9.37 x 5.08 x 8.78
0.00486167804
Group 51R
238 x 129 x 223
9.37 x 5.08 x 8.78
0.00486167804
52
186 x 147 x 210
7.32 x 5.79 x 8.27
0.00350653680
53
330 x 119 x 210
13.00 x 4.69 x 8.27
0.00385902820
54
186 x 154 x 212
7.32 x 6.06 x 8.35
0.00379697126
55
218 x 154 x 212
8.58 x 6.06 x 8.35
0.00415005372
56
254 x 154 x 212
10.00 x 6.06 x 8.35
0.00455001176
57
205 x 183 x 177
8.07 x 7.20 x 6.97
0.00419243965
Group 58
255 x 183 x 177
10.04 x 7.20 x 6.97
0.00419696552
Group 58R
255 x 183 x 177
10.04 x 7.20 x 6.97
0.00419696552
59
255 x 193 x 196
10.04 x 7.60 x 7.72
0.00487823520
60
332 x 160 x 225
13.07 x 6.30 x 8.86
0.00715049400
61
192 x 162 x 225
7.56 x 6.38 x 8.86
0.00385345125
62
225 x 162 x 225
8.86 x 6.38 x 8.86
0.00423795525
63
258 x 162 x 225
10.16 x 6.38 x 8.86
0.00517247950
64
296 x 162 x 225
11.65 x 6.38 x 8.86
0.00684753950
Group 65
306 x 192 x 192
12.05 x 7.56 x 7.56
0.00654091552
66
306 x 192 x 194
12.05 x 7.56 x 7.64
0.00658058864
67R
231 x 175 x 176
9.09 x 6.89 x 6.93
0.00369298394
70
208 x 179 x 186
8.19 x 7.05 x 7.32
0.00455980864
71
208 x 179 x 216
8.19 x 7.05 x 8.50
0.00578993800
72
230 x 179 x 210
9.06 x 7.05 x 8.27
0.00551168110
73
230 x 179 x 216
9.06 x 7.05 x 8.50
0.00595744800
74
260 x 184 x 222
10.24 x 7.24 x 8.74
0.00761221408
Group 75
230 x 179 x 186
9.06 x 7.05 x 7.32
0.00483792816
76
334 x 179 x 216
13.15 x 7.05 x 8.50
0.01000872000
77
306 x 184 x 222
12.05 x 7.24 x 8.74
0.00842506300
Group 78
260 x 179 x 186
10.24 x 7.05 x 7.32
0.00516115520
79
307 x 179 x 188
12.09 x 7.05 x 7.40
0.00537491120
Group 85
230 x 173 x 203
9.06 x 6.81 x 7.99
0.00486222594
Group 86
230 x 173 x 203
9.06 x 6.81 x 7.99
0.00486222594
90
243 x 175 x 175
9.57 x 6.89 x 6.89
0.00379176325
91
280 x 175 x 175
11.02 x 6.89 x 6.89
0.00509001750
92
316 x 175 x 175
12.44 x 6.89 x 6.89
0.00599487500
93
354 x 175 x 175
13.94 x 6.89 x 6.89
0.00788639375
Group 94R
315 x 175 x 190
12.40 x 6.89 x 7.48
0.00675875000
Group 95R
394 x 175 x 190
15.51 x 6.89 x 7.48
0.00891808125
Group 96R
242 x 175 x 175
9.53 x 6.89 x 7.48
0.00422529250
97R
252 x 175 x 190
9.92 x 6.89 x 7.48
0.00454480375
98R
283 x 175 x 190
11.14 x 6.89 x 7.48
0.00578242625
99
207 x 175 x 175
8.15 x 6.89 x 6.89
0.00359341125
99R
210 x 175 x 175
8.27 x 6.89 x 6.89
0.00364715875
100
260 x 179 x 188
10.24 x 7.05 x 7.40
0.00511193600
101
260 x 179 x 170
10.24 x 7.05 x 6.69
0.00474600960
121R
208 x 177 x 215
8.19 x 6.97 x 8.46
0.00392694708
124
265 x 175 x 214
10.43 x 6.89 x 8.43
0.00582720023
124R
262 x 177 x 218
10.31 x 6.97 x 8.58
0.00596407024
151R
188 x 125 x 225
7.40 x 4.92 x 8.86
0.00328940000
1
232 x 181 x 238
9.13 x 7.13 x 9.37
0.00439942256
2
264 x 181 x 238
10.39 x 7.13 x 9.37
0.00511829864
2E
492 x 105 x 232
19.37 x 4.13 x 9.13
0.00866126576
2N
254 x 141 x 227
10.00 x 5.55 x 8.94
0.00499256240
17HF
187 x 175 x 229
7.36 x 6.89 x 8.97
0.00380640988
19L
216 x 178 x 191
8.50 x 7.01 x 7.52
0.00296550416
3EE
491 x 111 x 225
19.33 x 4.37 x 8.86
0.00913801575
3ET
491 x 111 x 249
19.33 x 4.37 x 9.80
0.01019370825
Group 4D
527 x 222 x 250
20.75 x 8.74 x 9.84
0.04594772500
4DLT
508 x 208 x 202
20.00 x 8.19 x 7.95
0.03405899500
Group 6D
527 x 254 x 260
20.75 x 10.00 x 10.24
0.05369534000
Group 8D
527 x 283 x 250
20.75 x 11.14 x 9.84
0.05895497500
12T
179 x 177 x 202
7.05 x 6.97 x 7.95
0.00297095643
28
261 x 173 x 240
10.28 x 6.81 x 9.45
0.00636117320
29H
334 x 171 x 232
13.15 x 6.73 x 9.13
0.00820240768
30H
343 x 173 x 235
13.50 x 6.81 x 9.25
0.00849755375
Group 31
330 x 173 x 240
12.99 x 6.81 x 9.45
0.00841162350
3
298 x 181 x 238
11.73 x 7.13 x 9.37
0.00784090538
3EH
491 x 111 x 249
19.33 x 4.37 x 9.80
0.01019370825
4
334 x 181 x 238
13.15 x 7.13 x 9.37
0.00898898188
4EH
491 x 127 x 249
19.33 x 5.00 x 9.80
0.01098036675
5
394 x 181 x 238
15.51 x 7.13 x 9.37
0.01171429038
8A27
495 x 190 x 220
19.49 x 7.48 x 8.66
0.01540740000
8A27M
495 x 190 x 220
19.49 x 7.48 x 8.66
0.01540740000
8A31DTM
508 x 190 x 220
20.00 x 7.48 x 8.66
0.01640720000
8A31DTM
508 x 190 x 220
20.00 x 7.48 x 8.66
0.01640720000
8A31STDM
508 x 190 x 220
20.00 x 7.48 x 8.66
0.01640720000
Group 9A34
259 x 173 x 235
10.20 x 6.81 x 9.25
0.00536678350
9A65B
325 x 173 x 235
12.80 x 6.81 x 9.25
0.00743773125
Group 9A78
354 x 173 x 235
13.94 x 6.81 x 9.25
0.00853236925
Group 9AGM
329 x 172 x 225
12.95 x 6.77 x 8.86
0.00687609550
DP24
260 x 173 x 229
10.24 x 6.81 x 9.02
0.00642073413
DP27
330 x 173 x 235
12.99 x 6.81 x 9.25
0.00743773125
DP31
330 x 173 x 240
12.99 x 6.81 x 9.45
0.00770216400
Group DP31
330 x 173 x 240
12.99 x 6.81 x 9.45
0.00770216400
Is Group Size a fixed value?
No, the actual BCI Group Size can vary slightly between manufacturers and models, and generally, this is a range value rather than an exact value.
What is a Group24 battery?
The usual size of Group24 is 260173225mm (10.24*6.81*8.86ft), and the volume is generally 0.0060m³. It is usually used to manufacture 12V 100Ah 24V 50Ah lithium-ion battery packs. Typical application scenarios are RVs, backup power supplies, and home storage. Yes, batteries of this size are commonly used for energy storage. If it needs to be used as a motor, a supercapacitor can be installed.
What is a Group27 battery?
The usual size of Group 27 is 306173225mm (12.05*6.81*8.86ft), and the volume is generally 0.0072m³. It is usually used to manufacture 12V 100Ah and 12V 150Ah lithium-ion battery packs. Typical application scenarios are RVs, backup power supplies, and home storage. Can wait because the size is not much different. The overall application scenario is similar to Group24.
What do Group24 and Group27 batteries have in common?
As mentioned above, Group Size can only be used to standardize the size. As for what technology is used to manufacture battery packs of this size, there is no precise regulation. Therefore, we can use various technologies to manufacture:
- Polymer lithium-ion material
- Sodium ion material
- gel material
- Gel-cell material
- Flooded material
- Lithium-ion materials
What is the difference between Group24 and Group27 batteries?
The size difference between these two models is not big, and both can now be used to make lithium-ion batteries. The capacity gap is about 50Ah, and usually the voltage includes 12V, 24V or even 36V
How do you choose the Group Size that suits you?
You may feel confused by so many Group Sizes, but in fact, there is no need for them. Because generally, we must choose the smallest battery that can be manufactured. So you only have to think about one thing: what will you use the battery for? What space budget do you have? After understanding this, you only need to choose a Group Size that does not exceed your planned size.
Can I interchange Group24 and Group27 batteries?
Of course, it depends on your needs. But generally, most people will choose the smallest one. As a simple example, if you need a 12V 100Ah battery pack and you find there are two sizes, Group 24 and Group 27, or even Group 31, then how do you choose? Of course, you can choose both, but does choosing a smaller battery mean that your limited space can accommodate more capacity?
The smaller the Group size, the better, or the larger the better?
This issue should be looked at separately. If you have a specific capacity requirement, then in general, the smaller the Group Size, the better. However, the energy density of the battery pack has a limit. If you need a larger capacity, a smaller size often cannot satisfy it. In this case, you can only choose a battery with a larger Group Size.
Author Profile
Thomas Chen
Thomas Chen is a seasoned expert in the new energy industry, with a focus on lithium battery technology. A Shenzhen University alumnus, class of 2010, Thomas has cultivated a wealth of experience through pivotal roles at EVE and BYD. Renowned for his profound insights into the sector, he possesses a unique aptitude for identifying market trends and understanding customer needs. His articles offer a distinctive perspective, drawn from a rich background in the field.
Introduction:
When you purchase a battery, you can usually see the dimensions the seller provides directly. However, sometimes you may encounter the term “Group Size” on the battery casing, such as Group 24 or Group 27. Do you understand the meaning of these names? If you’re feeling confused, let’s clarify this together today.
What is ‘Group Size’? Who came up with it?
BCI Group Size (Battery Council International) is a standard used to identify and categorize automotive batteries, first introduced in 1920. BCI is a nonprofit organization comprising various battery-related industry organizations, forming an industry association. The initial purpose behind introducing Group Size was to standardize market classification standards, encouraging all manufacturers, service industries, and consumers to adhere to them for accurate and efficient communication. With the market standardized, providing a specific BCI Group Size is all needed to determine a battery’s size and shape, greatly simplifying communication and ensuring accuracy.
Why is it so rare to hear the term Group Size nowadays?
As you know, it has been 103 years since the BCI Group Size 1920 was proposed in 2023. The batteries used by BCI at that time were mainly lead-acid batteries. Now, we mainly use lithium-ion batteries. You know, lithium batteries are much smaller than lead-acid batteries in size and weight, so this concept is gradually fading out of people’s sight, and people are more accustomed to describing the size directly instead of continuing to use the old BCI Size.
Complete Group Size List:
Model
Size（mm）
Size（inches）
Space（m³）
21
208 x 173 x 222
8.19 x 6.81 x 8.74
0.00389502388
21R
208 x 173 x 222
8.19 x 6.81 x 8.74
0.00389502388
22F
241 x 175 x 211
9.49 x 6.89 x 8.31
0.00483441375
22HF
241 x 175 x 229
9.49 x 6.89 x 9.02
0.00530067175
Group 22NF
240 x 140 x 227
9.45 x 5.51 x 8.94
0.00390513986
22R
229 x 175 x 211
9.02 x 6.89 x 8.31
0.00445749713
Group 24
260 x 173 x 225
10.24 x 6.81 x 8.86
0.00598696500
24F
273 x 173 x 229
10.75 x 6.81 x 9.02
0.00642073413
24H
260 x 173 x 238
10.24 x 6.81 x 9.37
0.00693144800
24R
260 x 173 x 229
10.24 x 6.81 x 9.02
0.00642073413
24T
260 x 173 x 248
10.24 x 6.81 x 9.76
0.00754501184
25
230 x 175 x 225
9.06 x 6.89 x 8.86
0.00524355450
Group 26
208 x 173 x 197
8.19 x 6.81 x 7.76
0.00353679292
Group 26R
208 x 173 x 197
8.19 x 6.81 x 7.76
0.00353679292
Group 27
306 x 173 x 225
12.05 x 6.81 x 8.86
0.00721795525
27F
318 x 173 x 227
12.52 x 6.81 x 8.94
0.00760644714
27H
298 x 173 x 235
11.73 x 6.81 x 9.25
0.00720434640
29NF
330 x 140 x 227
12.99 x 5.51 x 8.94
0.00568620726
33
338 x 173 x 238
13.31 x 6.81 x 9.37
0.00858591224
Group 34
260 x 173 x 200
10.24 x 6.81 x 7.87
0.00550277520
Group 34R
260 x 173 x 200
10.24 x 6.81 x 7.87
0.00550277520
Group 35
230 x 175 x 225
9.06 x 6.89 x 8.86
0.00524355450
36R
263 x 183 x 206
10.35 x 7.20 x 8.11
0.00561068878
40R
278 x 175 x 175
10.94 x 6.89 x 6.89
0.00441725075
41
293 x 175 x 175
11.54 x 6.89 x 6.89
0.00505510650
42
242 x 175 x 175
9.53 x 6.89 x 6.89
0.00376838087
43
334 x 175 x 205
13.15 x 6.89 x 8.07
0.00824337587
45
240 x 140 x 227
9.45 x 5.51 x 8.94
0.00390513986
46
273 x 173 x 229
10.75 x 6.81 x 9.02
0.00642073413
Group 47
242 x 175 x 190
9.53 x 6.89 x 7.48
0.00395249000
Group 48
278 x 175 x 190
10.94 x 6.89 x 7.48
0.00581518600
Group 49
354 x 175 x 190
13.94 x 6.89 x 7.48
0.00733720800
50
343 x 127 x 254
13.50 x 5.00 x 10.00
0.00854293200
Group 51
238 x 129 x 223
9.37 x 5.08 x 8.78
0.00486167804
Group 51R
238 x 129 x 223
9.37 x 5.08 x 8.78
0.00486167804
52
186 x 147 x 210
7.32 x 5.79 x 8.27
0.00350653680
53
330 x 119 x 210
13.00 x 4.69 x 8.27
0.00385902820
54
186 x 154 x 212
7.32 x 6.06 x 8.35
0.00379697126
55
218 x 154 x 212
8.58 x 6.06 x 8.35
0.00415005372
56
254 x 154 x 212
10.00 x 6.06 x 8.35
0.00455001176
57
205 x 183 x 177
8.07 x 7.20 x 6.97
0.00419243965
Group 58
255 x 183 x 177
10.04 x 7.20 x 6.97
0.00419696552
Group 58R
255 x 183 x 177
10.04 x 7.20 x 6.97
0.00419696552
59
255 x 193 x 196
10.04 x 7.60 x 7.72
0.00487823520
60
332 x 160 x 225
13.07 x 6.30 x 8.86
0.00715049400
61
192 x 162 x 225
7.56 x 6.38 x 8.86
0.00385345125
62
225 x 162 x 225
8.86 x 6.38 x 8.86
0.00423795525
63
258 x 162 x 225
10.16 x 6.38 x 8.86
0.00517247950
64
296 x 162 x 225
11.65 x 6.38 x 8.86
0.00684753950
Group 65
306 x 192 x 192
12.05 x 7.56 x 7.56
0.00654091552
66
306 x 192 x 194
12.05 x 7.56 x 7.64
0.00658058864
67R
231 x 175 x 176
9.09 x 6.89 x 6.93
0.00369298394
70
208 x 179 x 186
8.19 x 7.05 x 7.32
0.00455980864
71
208 x 179 x 216
8.19 x 7.05 x 8.50
0.00578993800
72
230 x 179 x 210
9.06 x 7.05 x 8.27
0.00551168110
73
230 x 179 x 216
9.06 x 7.05 x 8.50
0.00595744800
74
260 x 184 x 222
10.24 x 7.24 x 8.74
0.00761221408
Group 75
230 x 179 x 186
9.06 x 7.05 x 7.32
0.00483792816
76
334 x 179 x 216
13.15 x 7.05 x 8.50
0.01000872000
77
306 x 184 x 222
12.05 x 7.24 x 8.74
0.00842506300
Group 78
260 x 179 x 186
10.24 x 7.05 x 7.32
0.00516115520
79
307 x 179 x 188
12.09 x 7.05 x 7.40
0.00537491120
Group 85
230 x 173 x 203
9.06 x 6.81 x 7.99
0.00486222594
Group 86
230 x 173 x 203
9.06 x 6.81 x 7.99
0.00486222594
90
243 x 175 x 175
9.57 x 6.89 x 6.89
0.00379176325
91
280 x 175 x 175
11.02 x 6.89 x 6.89
0.00509001750
92
316 x 175 x 175
12.44 x 6.89 x 6.89
0.00599487500
93
354 x 175 x 175
13.94 x 6.89 x 6.89
0.00788639375
Group 94R
315 x 175 x 190
12.40 x 6.89 x 7.48
0.00675875000
Group 95R
394 x 175 x 190
15.51 x 6.89 x 7.48
0.00891808125
Group 96R
242 x 175 x 175
9.53 x 6.89 x 7.48
0.00422529250
97R
252 x 175 x 190
9.92 x 6.89 x 7.48
0.00454480375
98R
283 x 175 x 190
11.14 x 6.89 x 7.48
0.00578242625
99
207 x 175 x 175
8.15 x 6.89 x 6.89
0.00359341125
99R
210 x 175 x 175
8.27 x 6.89 x 6.89
0.00364715875
100
260 x 179 x 188
10.24 x 7.05 x 7.40
0.00511193600
101
260 x 179 x 170
10.24 x 7.05 x 6.69
0.00474600960
121R
208 x 177 x 215
8.19 x 6.97 x 8.46
0.00392694708
124
265 x 175 x 214
10.43 x 6.89 x 8.43
0.00582720023
124R
262 x 177 x 218
10.31 x 6.97 x 8.58
0.00596407024
151R
188 x 125 x 225
7.40 x 4.92 x 8.86
0.00328940000
1
232 x 181 x 238
9.13 x 7.13 x 9.37
0.00439942256
2
264 x 181 x 238
10.39 x 7.13 x 9.37
0.00511829864
2E
492 x 105 x 232
19.37 x 4.13 x 9.13
0.00866126576
2N
254 x 141 x 227
10.00 x 5.55 x 8.94
0.00499256240
17HF
187 x 175 x 229
7.36 x 6.89 x 8.97
0.00380640988
19L
216 x 178 x 191
8.50 x 7.01 x 7.52
0.00296550416
3EE
491 x 111 x 225
19.33 x 4.37 x 8.86
0.00913801575
3ET
491 x 111 x 249
19.33 x 4.37 x 9.80
0.01019370825
Group 4D
527 x 222 x 250
20.75 x 8.74 x 9.84
0.04594772500
4DLT
508 x 208 x 202
20.00 x 8.19 x 7.95
0.03405899500
Group 6D
527 x 254 x 260
20.75 x 10.00 x 10.24
0.05369534000
Group 8D
527 x 283 x 250
20.75 x 11.14 x 9.84
0.05895497500
12T
179 x 177 x 202
7.05 x 6.97 x 7.95
0.00297095643
28
261 x 173 x 240
10.28 x 6.81 x 9.45
0.00636117320
29H
334 x 171 x 232
13.15 x 6.73 x 9.13
0.00820240768
30H
343 x 173 x 235
13.50 x 6.81 x 9.25
0.00849755375
Group 31
330 x 173 x 240
12.99 x 6.81 x 9.45
0.00841162350
3
298 x 181 x 238
11.73 x 7.13 x 9.37
0.00784090538
3EH
491 x 111 x 249
19.33 x 4.37 x 9.80
0.01019370825
4
334 x 181 x 238
13.15 x 7.13 x 9.37
0.00898898188
4EH
491 x 127 x 249
19.33 x 5.00 x 9.80
0.01098036675
5
394 x 181 x 238
15.51 x 7.13 x 9.37
0.01171429038
8A27
495 x 190 x 220
19.49 x 7.48 x 8.66
0.01540740000
8A27M
495 x 190 x 220
19.49 x 7.48 x 8.66
0.01540740000
8A31DTM
508 x 190 x 220
20.00 x 7.48 x 8.66
0.01640720000
8A31DTM
508 x 190 x 220
20.00 x 7.48 x 8.66
0.01640720000
8A31STDM
508 x 190 x 220
20.00 x 7.48 x 8.66
0.01640720000
Group 9A34
259 x 173 x 235
10.20 x 6.81 x 9.25
0.00536678350
9A65B
325 x 173 x 235
12.80 x 6.81 x 9.25
0.00743773125
Group 9A78
354 x 173 x 235
13.94 x 6.81 x 9.25
0.00853236925
Group 9AGM
329 x 172 x 225
12.95 x 6.77 x 8.86
0.00687609550
DP24
260 x 173 x 229
10.24 x 6.81 x 9.02
0.00642073413
DP27
330 x 173 x 235
12.99 x 6.81 x 9.25
0.00743773125
DP31
330 x 173 x 240
12.99 x 6.81 x 9.45
0.00770216400
Group DP31
330 x 173 x 240
12.99 x 6.81 x 9.45
0.00770216400
Is Group Size a fixed value?
No, the actual BCI Group Size can vary slightly between manufacturers and models, and generally, this is a range value rather than an exact value.
What is a Group24 battery?
The usual size of Group24 is 260173225mm (10.24*6.81*8.86ft), and the volume is generally 0.0060m³. It is usually used to manufacture 12V 100Ah 24V 50Ah lithium-ion battery packs. Typical application scenarios are RVs, backup power supplies, and home storage. Yes, batteries of this size are commonly used for energy storage. If it needs to be used as a motor, a supercapacitor can be installed.
What is a Group27 battery?
The usual size of Group 27 is 306173225mm (12.05*6.81*8.86ft), and the volume is generally 0.0072m³. It is usually used to manufacture 12V 100Ah and 12V 150Ah lithium-ion battery packs. Typical application scenarios are RVs, backup power supplies, and home storage. Can wait because the size is not much different. The overall application scenario is similar to Group24.
What do Group24 and Group27 batteries have in common?
As mentioned above, Group Size can only be used to standardize the size. As for what technology is used to manufacture battery packs of this size, there is no precise regulation. Therefore, we can use various technologies to manufacture:
- Polymer lithium-ion material
- Sodium ion material
- gel material
- Gel-cell material
- Flooded material
- Lithium-ion materials
What is the difference between Group24 and Group27 batteries?
The size difference between these two models is not big, and both can now be used to make lithium-ion batteries. The capacity gap is about 50Ah, and usually the voltage includes 12V, 24V or even 36V
How do you choose the Group Size that suits you?
You may feel confused by so many Group Sizes, but in fact, there is no need for them. Because generally, we must choose the smallest battery that can be manufactured. So you only have to think about one thing: what will you use the battery for? What space budget do you have? After understanding this, you only need to choose a Group Size that does not exceed your planned size.
Can I interchange Group24 and Group27 batteries?
Of course, it depends on your needs. But generally, most people will choose the smallest one. As a simple example, if you need a 12V 100Ah battery pack and you find there are two sizes, Group 24 and Group 27, or even Group 31, then how do you choose? Of course, you can choose both, but does choosing a smaller battery mean that your limited space can accommodate more capacity?
The smaller the Group size, the better, or the larger the better?
This issue should be looked at separately. If you have a specific capacity requirement, then in general, the smaller the Group Size, the better. However, the energy density of the battery pack has a limit. If you need a larger capacity, a smaller size often cannot satisfy it. In this case, you can only choose a battery with a larger Group Size.
Author Profile
Thomas Chen
Thomas Chen is a seasoned expert in the new energy industry, with a focus on lithium battery technology. A Shenzhen University alumnus, class of 2010, Thomas has cultivated a wealth of experience through pivotal roles at EVE and BYD. Renowned for his profound insights into the sector, he possesses a unique aptitude for identifying market trends and understanding customer needs. His articles offer a distinctive perspective, drawn from a rich background in the field.
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