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BCI Battery Group Size Chart (Group 21,24,27,31,8D)

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BCI Battery Group Size Chart (Group 21,24,27,31,8D)

2025-03-31

What is a BCI Battery Group Size?

BCI Battery Group Size Chart

A BCI battery group size is a type of designation system universal in nature, used throughout the industry for categorizing lead-acid batteries based on physical dimensions, terminal configurations, and other design characteristics. Since this forms an industry-wide sizing system, compatibility between batteries and the appropriate equipment or vehicles being powered is thus ensured.

The BCI group size functions like a universal language that assists in identifying and selecting the proper battery for a particular application. It allows manufacturers, retailers, and consumers to easily match batteries with the correct size and specifications required by different devices, vehicles, or machinery.

Having a common sizing system means most batteries are unique in shape, size, and terminal arrangement. Without a common method of labeling, it would be really difficult to ensure that the right battery fits a particular application. In essence, the BCI group size makes selection easier by granting the right battery to be chosen for optimal performance, safety, and compatibility.

What Makes a BCI Group Size?

 

  • Battery Size: Ensure proper installation.
  • Battery Performance: Check ampere hours.
  • Terminal Location: Confirm the vehicle is properly connected to the battery.
  • Battery Type: Identify the chemistry.

 

Common BCI Battery Group Size Categories

BCI battery group sizes are primarily categorized into three major segments: AutomotiveCommercial, and Deep-cycle. Each category serves specific applications and has distinct characteristics in terms of design, performance, and sizing.

Deep-Cycle BCI Battery Group Sizes:

Deep-cycle batteries are optimized for applications that require sustained energy delivery over an extended period, such as marinerecreational vehicles (RVs), golf carts, and renewable energy systems. These batteries are designed to withstand repeated deep discharge and recharge cycles. Common deep-cycle BCI group sizes include 24, 27, 31, and 8D.

 

Automotive BCI Battery Group Sizes:

These batteries are designed for starting, lighting, and ignition (SLI) applications in passenger vehicles, light trucks, and other automotive uses. Automotive batteries prioritize high cranking power for reliable engine starts and are sized accordingly. Common automotive BCI group sizes include 24, 25, 34, 35, 51R, and 65.

 

Commercial BCI Battery Group Sizes:

Commercial batteries cater to the needs of heavy-duty vehicles, machinery, and equipment used in industries such as construction, mining, and transportation. These batteries are engineered for deep cycling and high reserve capacity to power auxiliary equipment and accessories. Popular commercial BCI group sizes include 4D, 8D, and 31.

 

It’s important to note that while these categories provide a general guideline, some battery group sizes may overlap or be used in multiple applications, depending on specific requirements and manufacturer recommendations.

Battery Groups Sizes Chart

BCI Group Size L x W x H (mm) L x W x H (inches) BSLBATT Lithium battery
21 208 x 173 x 222 8.19 x 6.81 x 8.75  
21R 208 x 173 x 222 8.19 x 6.81 x 8.75  
22F 241 x 175 x 211 9.50 x 6.88 x 8.31  
22HF 241 x 175 x 229 9.50 x 6.88 x 9.00  
22NF 240 x 140 x 227 9.44 x 5.50 x 8.94  
22R 229 x 175 x 211 9.00 x 6.88 x 8.31  
24 260 x 173 x 225 10.25 x 6.81 x 8.88 24V 50Ah
24V 67AH
48V 18Ah
24F 273 x 173 x 229 10.75 x 6.81 x 9.00  
24H 260 x 173 x 238 10.25 x 6.81 x 9.38  
24R 260 x 173 x 229 10.25 x 6.81 x 9.00  
24T 260 x 173 x 248 10.25 x 6.81 x 9.75  
25 230 x 175 x 225 9.06 x 6.88 x 8.88  
26 208 x 173 x 197 8.19 x 6.81 x 7.75 12V 50AH
26R 208 x 173 x 197 8.19 x 6.81 x 7.75  
27 306 x 173 x 225 12.06 x 6.81 x 8.88  
27F 318 x 173 x 227 12.50 x 6.81 x 8.94  
27H 298 x 173 x 235 11.75 x 6.81 x 9.25  
29NF 330 x 140 x 227 13.00 x 5.50 x 8.94  
31 330 x 173 x 240 13.00 x 6.81 x 9.44 12V 100Ah 
12V 120Ah
33 338 x 173 x 238 13.31 x 6.81 x 9.38  
34 260 x 173 x 200 10.25 x 6.81 x 7.88  
34R 260 x 173 x 200 10.25 x 6.81 x 7.88  
35 230 x 175 x 225 9.06 x 6.88 x 8.88  
36R 263 x 183 x 206 10.38 x 7.19 x 8.12  
40R 278 x 175 x 175 11.00 x 6.94 x 6.94  
41 293 x 175 x 175 11.56 x 6.94 x 6.94  
42 242 x 175 x 175 9.56 x 6.94 x 6.94  
43 334 x 175 x 205 13.13 x 6.88 x 8.06  
45 240 x 140 x 227 9.44 x 5.50 x 8.94  
46 273 x 173 x 229 10.75 x 6.81 x 9.00  
47 242 x 175 x 190 9.56 x 6.88 x 7.50  
48 278 x 175 x 190 11.00 x 6.88 x 7.50  
49 354 x 175 x 190 13.94 x 6.88 x 7.50  
50 343 x 127 x 254 13.50 x 5.00 x 10.00  
51 238 x 129 x 223 9.38 x 5.06 x 8.75  
51R 238 x 129 x 223 9.38 x 5.06 x 8.75  
52 186 x 147 x 210 7.31 x 5.81 x 8.25  
53 330 x 119 x 210 13.00 x 4.69 x 8.25  
54 186 x 154 x 212 7.31 x 6.06 x 8.38  
55 218 x 154 x 212 8.56 x 6.06 x 8.38  
56 254 x 154 x 212 10.00 x 6.06 x 8.38  
57 205 x 183 x 177 8.06 x 7.19 x 6.94  
58 255 x 183 x 177 10.06 x 7.19 x 6.94  
58R 255 x 183 x 177 10.06 x 7.19 x 6.94  
59 255 x 193 x 196 10.06 x 7.63 x 7.75  
60 332 x 160 x 225 13.06 x 6.31 x 8.88  
61 192 x 162 x 225 7.56 x 6.38 x 8.88  
62 225 x 162 x 225 8.88 x 6.38 x 8.88  
63 258 x 162 x 225 10.19 x 6.38 x 8.88  
64 296 x 162 x 225 11.63 x 6.38 x 8.88  
65 306 x 192 x 192 12.06 x 7.56 x 7.56  
66 306 x 192 x 194 12.06 x 7.56 x 7.69  
67R 231 x 175 x 176 9.13 x 6.88 x 6.94  
70 208 x 179 x 186 8.19 x 7.06 x 7.31  
71 208 x 179 x 216 8.19 x 7.06 x 8.50  
72 230 x 179 x 210 9.06 x 7.06 x 8.25  
73 230 x 179 x 216 9.06 x 7.06 x 8.50  
74 260 x 184 x 222 10.25 x 7.25 x 8.75  
75 230 x 179 x 186 9.06 x 7.06 x 7.31  
76 334 x 179 x 216 13.13 x 7.06 x 8.50  
77 306 x 184 x 222 12.06 x 7.25 x 8.75  
 78 260 x 179 x 186 10.25 x 7.06 x 7.31  
79 307 x 179 x 188 12.06 x 7.06 x 7.38  
85 230 x 173 x 203 9.06 x 6.81 x 8.00  
86 230 x 173 x 203 9.06 x 6.81 x 8.00  
90 243 x 175 x 175 9.56 x 6.88 x 6.88  
91 280 x 175 x 175 11.00 x 6.88 x 6.88  
92 316 x 175 x 175 12.44 x 6.88 x 6.88  
93 354 x 175 x 175 13.94 x 6.88 x 6.88  
94R 315 x 175 x 190 12.44 x 6.88 x 7.50  
95R 394 x 175 x 190 15.56 x 6.88 x 7.50  
96R 242 x 175 x 175 9.50 x 6.88 x 6.88  
97R 252 x 175 x 190 9.94 x 6.88 x 7.50  
98R 283 x 175 x 190 11.13 x 6.88 x 7.50  
99 207 x 175 x 175 8.13 x 6.88 x 6.88  
99R 210 x 175 x 175 8.25 x 6.88 x 6.88  
100 260 x 179 x 188 10.25 x 7.06 x 7.38  
101 260 x 179 x 170 10.25 x 7.06 x 6.69  
121R 208 x 177 x 215 8.25 x 7.00 x 8.50  
124 265 x 175 x 214 10.44 x 6.88 x 8.44  
124R 262 x 177 x 218 10.38 x 7.00 x 8.62  
151R 188 x 125 x 225 7.44 x 4.94 x 8.88  

Passenger Car and Light Commercial 6V Batteries (3 Cells)

1 232 x 181 x 238 9.13 x 7.13 x 9.38  
2 264 x 181 x 238 10.38 x 7.13 x 9.38  
2E 492 x 105 x 232 19.38 x 4.13 x 9.13  
2N 254 x 141 x 227 10.00 x 5.56 x 8.94  
17HF 187 x 175 x 229 7.38 x 6.88 x 9.00  
19L 216 x 178 x 191 8.50 x 7.00 x 7.50  

Heavy Duty Commercial and Special Tractor 12V Batteries (6 Cells)

3EE 491 x 111 x 225 19.31 x 4.38 x 8.88  
3ET 491 x 111 x 249 19.31 x 4.38 x 9.81  
Group 4D Batteries 527 x 222 x 250 20.75 x 8.75 x 9.88  
4DLT 508 x 208 x 202 20.00 x 8.19 x 7.94

12V 100AH

12V 120AH
24V 100AH
36V 67AH

Group 6D Batteries 527 x 254 x 260 20.75 x 10.00 x 10.25  
Group 8D Batteries 527 x 283 x 250 20.75 x 11.13 x 9.88 12V 135AH
12V 200AH
12V 300AH
12V 400-500AH
24V 150AH
24V 200AH
36V 100AH
12T 179 x 177 x 202 7.06 x 6.94 x 7.94  
28 261 x 173 x 240 10.25 x 6.81 x 9.44  
29H 334 x 171 x 232 13.13 x 6.75 x 9.13  
30H 343 x 173 x 235 13.50 x 6.81 x 9.25  
Group 31 Batteries 330 x 173 x 240 13.00 x 6.81 x 9.44  

Heavy Duty Commercial and Special Tractor 6V Batteries (3 Cells)

3 298 x 181 x 238 11.75 x 7.13 x 9.38  
3EH 491 x 111 x 249 19.31 x 4.38 x 9.81  
4 334 x 181 x 238 13.13 x 7.13 x 9.38  
4EH 491 x 127 x 249 19.31 x 5.00 x 9.81  
5D 349 x 181 x 238 13.75 x 7.13 x 9.38  
7D 413 x 181 x 238 16.25 x 7.13 x 9.38  

Electric Vehicle 6V Batteries (3 Cells)

Group GC2 Batteries 264 x 183 x 277 10.38 x 7.19 x 10.88  
Group GC2H Batteries 264 x 183 x 295 10.38 x 7.19 x 11.62  

Electric Vehicle 8V Batteries (4 Cells)

Group GC8 Batteries 264 x 183 x 277 10.38 x 7.19 x 10.88  
Group GC8H Batteries 264 x 183 x 295 10.38 x 7.19 x 11.62  

Electric Vehicle 12V Batteries (6 Cells)

Group GC12 Batteries 327 x 183 x 277 12.88 x 7.19 x 10.88  

Commercial/Marine 8V Batteries (4 Cells)

981 527 x 191 x 273 20.75 x 7.50 x 10.75  
982 546 x 191 x 267 21.50 x 7.50 x 10.50  
983 622 x 191 x 267 24.50 x 7.50 x 10.50  
984 699 x 191 x 267 27.50 x 7.50 x 10.50  
985 683 x 216 x 273 26.88 x 8.50 x 11.75  

General Purpose 12V Batteries (6 Cells)

Group U1 Batteries 197 x 132 x 186 7.75 x 5.19 x 7.31 12V 20AH
Group U1R Batteries 197 x 132 x 186 7.75 x 5.19 x 7.31  
U2 160 x 132 x 181 6.31 x 5.19 x 7.13  

Ordnance 12V Batteries (6 Cells)

2H 260 x 135 x 227 10.25 x 5.31 x 8.94  
6T 286 x 267 x 230 11.25 x 10.50 x 9.06  

Ordnance 24V Batteries (12 Cells)

4H 273 x 262 x 229 10.75 x 10.31 x 9.00  

Floor Scrubber 6V Commercial Batteries (3 Cells)

901 298 x 181 x 302 11.75 x 7.13 x 11.88  
902 302 x 181 x 371 12.00 x 7.13 x 14.62  
903 302 x 181 x 432 12.00 x 7.13 x 17.00  

Floor Scrubber 12V Commercial Batteries (6 Cells)

920 356 x 171 x 311 14.00 x 6.75 x 12.50  
921 397 x 181 x 378 15.75 x 7.13 x 14.88  

BCI Battery Groups, DIN, and EN Codes Cross Reference Chart

Maximum BCI Battery Dimensions
(L x W x H, inch/mm)
BCI Group Maximum DIN/EN Battery Dimensions
(L x W x H mm)
DIN Codes EN Codes
10 15/16 x 6 7/8 x 6 7/8
277 x 175 x 175
40R 278 x 175 x 175 T6, LB3 66LB
11 3/16 x 6 7/8 x 6 7/8
293 x 175 x 175
41 293 x 175 x 175 T65 54LB
9 5/16 x 6 13/16 x 6 13/16
237 x 173 x 173
42 242 x 175 x 175 T5, LB2 45LB
9 7/16 x 6 7/8 x 7 1/2
242 x 175 x 190
47 242 x 175 x 190 H5, L2 55L2
11 x 6 7/8 x 7 1/2
278 x 175 x 190
48 278 x 175 x 190 H6, L3 66L3
13 15/16 x 6 7/8 x 7 1/2
354 x 175 x 190
49 354 x 175 x 190 H8, L5 88L5
9 11/16 x 6 7/8 x 6 7/8
246 x 175 x 175
90 242 x 175 x 175 T5, LB2 45LB
11 x 6 7/8 x 6 7/8
280 x 175 x 175
91 278 x 175 x 175 T6, LB3 66LB
12 1/2 x 6 7/8 x 6 7/8
317 x 175 x 175
92 315 x 175 x 175 T7, LB4 77LB
15 x 6 7/8 x 6 7/8
354 x 175 x 175
93 354 x 175 x 175 T8, LB5 88LB
12 7/16 x 6 7/8 x 7 1/2
315 x 175 x 190
94R 315 x 175 x 190 H7, L4 77L4
15 9/16 x 6 7/8 x 7 1/2
394 x 175 x 190
95R 394 x 175 x 190 H9, L6
9 15/16 x 6 7/8 x 7 1/2
252 x 175 x 190
97R 252 x 175 x 190 H5, L2 55L2
11 1/8 x 6 7/8 x 7 1/2
283 x 175 x 190
98R 283 x 175 x 190 H6, L3 66L3
8 1/8 x 6 7/8 x 6 7/8
207 x 175 x 175
99 207 x 175 x 175 T4, LB1 36LB
8 1/4 x 6 7/8 x 6 7/8
210 x 175 x 175
99R 210 x 175 x 175 T4, LB1 36LB
175 x 175 x 190 H3, L0 32L0
297 x 175 x 190 H4, L1 45L1

This cross-reference chart lists only the battery dimensions, omitting important details like terminal orientation, terminal type, base clamping type, lifting edge, and other small but significant factors.

 

Most battery packs in the list have very similar dimensions, except for BCI Group 48 and BCI Group 49. For instance, a BCI Group 48 battery measures 278 x 175 x 192 mm, with the positive terminal on the right. It is equivalent to DIN/EN battery packs labeled H6, L3, and 66L3, which measure 278 x 175 x 190 mm, also with the positive terminal on the right.

 

In contrast, the BCI Group 98R battery pack has dimensions of 283 x 175 x 190 mm, with the positive terminal on the right. It closely matches the H6, L3, and 66L3 packs, being only about 5 mm longer, allowing for a generally compatible fit in the H6 battery compartment.

When replacing a battery, always check the actual dimensions and measure the battery compartment. Be sure to verify battery orientation, terminal type, fixing system, and other details.

12V Deep Cycle Lithium Batteries

Small 12V deep cycle and general-purpose batteries have SLA and LiFePO4 types. Common applications of these batteries are UPS devices, alarms, toys, wheelchairs, and so on.

The popular models commonly come in the form of smaller capacities, usually up to 30-35Ah, and normally come with a standard Group U1 and U1R batteries as the most common choices.

For applications requiring larger deep cycle or general-purpose batteries, refer to larger groups, including 24, 27 or 31.
 
The following chart is representative of many of the most popular small 12V general-purpose batteries, their dimensions and terminal configuration.

Nominal Capacity Dimensions inches Dimensions mm Terminals
(L x W x H) (L x W x H)
12V 2.9Ah 3.11 x 2.20 x 3.90  79 x 56 x 99  F1 (T1)
12V 3.5Ah 5.28 x 2.64 x 2.38  134 x 67 x 61  F1 (T1)
12V 4Ah 3.54 x 2.76 x 3.98 90 x 70 x 101  F1 (T1)
12V 5Ah 3.54 x 2.76 x 3.98 90 x 70 x 101  F1 (T1)
12V 7Ah 5.94 x 2.56 x 3.7  151 x 65 x 94  F1 (mostly)
12V 9Ah 5.94 x 2.56 x 3.7 151 x 65 x 94  F2 (mostly)
12V 10Ah 5.94 x 2.56 x 4.37  151 x 65 x 111  F2 (T2) (mostly)
12V 12Ah 5.94 x 3.86 x 3.98  151 x 98 x 101  F2 (mostly)
12V 15Ah 5.94 x 3.86 x 3.98  151 x 98 x 101  F2
12V 18Ah, 19Ah, 20Ah+ 7.15 x 3.03 x 6.59  181 x 77 x 167  T3 (NB), M5, M6
12V 26Ah 6.89 x 6.54 x 4.94  175 x 166 x 126  NB
12V 30Ah 6.50 x 4.90 x 6.90  165 x 125 x 175  T3 (NB)
12V 35Ah 7.68 x 5.12 x 6.46  195 x 130 x 164  T6 (NB)
12V 35Ah (U1, U1R) 7.75 x 5.18 x 7.31  197 x 132 x 186  NB
12V 55Ah 9.04 x 5.45 x 8.15  230 x 139 x 207  T6 (NB)
12V 80Ah 10.16 x 6.65 x 8.20  258 x 169 x 208  T6 (NB)

What are the most popular battery pack sizes?

Group 24:

For smaller vehicles, such as compact cars and some midsize cars.

Group 35:

Commonly found in compact cars, small to midsize vehicles, and light trucks.

Group 48 (H6):

Typically used in larger vehicles, such as full-size cars, SUVs, and trucks.

Group 49 (H8):

For larger vehicles with high power needs, such as SUVs and luxury cars.

Group 51R:

Designed for compact cars and hybrids where space is limited.

Group 65:

For larger vehicles that need more power, such as trucks and performance cars.

Group 78 (H7):

Commonly found in larger SUVs, trucks, and full-size cars.

These sizes apply to a wide range of vehicles, so it’s best to consult your vehicle owner’s manual or a professional to determine the appropriate battery pack size.

How to Care for Your Car Battery

Proper care of your car battery can extend its lifespan and ensure reliable performance. Here are some essential tips:

  1. Regular Inspections: Frequently check for corrosion, loose connections, and leaks. Cleaning the terminals helps maintain a secure connection.

  2. Keep It Clean: Use a mixture of baking soda and water to gently clean the battery terminals, removing any buildup for optimal performance.

  3. Limit Electrical Use: Minimize the use of electrical accessories when the engine is off to avoid draining the battery.

  4. Drive Regularly: Make sure to drive your car at least once a week for a reasonable distance to keep the battery charged and prevent deterioration.

  5. Temperature Protection: Extreme temperatures can negatively impact battery performance. Park in the shade during hot weather, and consider using a thermal blanket in the winter.

  6. Charging System Inspections: Regularly test your car’s charging system to identify potential issues early and prevent battery-related problems.

  7. Learn to Jump-Start: Knowing how to safely jump-start a dead battery is a valuable skill to have in emergencies.

By following these tips and maintaining other components, such as belts, you can help ensure the overall health of your vehicle and prolong its lifespan.

FAQs

What sizes do batteries come in?

 

Purchase a compatible battery for your golf cart and save yourself from really costly mistakes.purchasing locally:purchase for your needs.Batteries are available in different sizes for various applications. The common ones include AAA, AA, C, D, and 9-volt; the smallest in size and the lowest capacity is the AAA, while the D-type batteries are of a bigger size for higher energy storage. The requirements of the device determine which one has to be used in order to obtain the best performance from it. Other less common sizes include A, B, N, and CR123A. It is always better to check the size from the device’s specification or from the manufacturer.

Which is bigger: C or D battery?

 

C and D batteries are cylindrical dry cells. They differ in their size and capacity. A C battery has about 50 mm in length and about 26.2 mm in diameter. This makes it larger than the triple A and double A batteries but smaller than a D battery. The D batteries are larger in size, about 61.5 mm by 33 mm, with higher energy capacity and hence useful at higher power applications. Both provide a nominal voltage of 1.5 volts and come in alkaline, lithium, and rechargeable options.

What battery size is larger than AA?

 

While the size of AAA batteries is smaller compared to AA, there is another size called A, which is a bit bigger compared to the batteries of type AA. The batteries of type A have a diameter of approximately 17 mm and a length of approximately 50 mm, similar to AA but with higher charge capacity up to 4500mAh. They find applications in power tools, older laptop batteries, and devices needing sustained power and high current output, hence finding wide versatility for various applications.

What are the sizes and types of car batteries?

 

Car batteries come in a variety of sizes, standardized by BCI, which assigns each battery a group number that includes dimensional inches and millimeters. One of the most common batteries is a 24F that fits most models of Honda, Toyota, Nissan, and Acura. Items to remember when buying a car battery are terminal type, configuration, mounting system, polarity, cranking amps, and cold cranking amps, which are necessary to start a car in cold conditions. All of these specifications are important for understanding compatibility and performance for your vehicle.

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