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

What is a BCI Battery Group Size?

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: Automotive, Commercial, 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 marine, recreational 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
Nominal Capacity	(L x W x H)	(L x W x H)	Terminals
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:

Regular Inspections: Frequently check for corrosion, loose connections, and leaks. Cleaning the terminals helps maintain a secure connection.
Keep It Clean: Use a mixture of baking soda and water to gently clean the battery terminals, removing any buildup for optimal performance.
Limit Electrical Use: Minimize the use of electrical accessories when the engine is off to avoid draining the battery.
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.
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.
Charging System Inspections: Regularly test your car’s charging system to identify potential issues early and prevent battery-related problems.
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.