BCI Battery Groups Size Charts

BCI Battery Groups define the maximum sizes of the batteries and classify the batteries into the size groups.

When looking for the right battery, it is always a good practice to check the actual size of Your battery compartment and the actual size of the battery - some batteries are slightly larger than the battery size they are classified in (by their manufacturer), which can cause issues.

Most Popular BCI Battery Groups

The following chart lists several most popular BCI Battery Groups commonly used as trolling motor batteries, with their general features.

BCI Battery Group Size Battery Size (L x W x H) (inches/mm) Nominal Capacity (Ah) Nominal CCA (Amps) Reserve Capacity (RC) (min)
Group 4D Batteries 20.75 x 8.75 x 9.875
527 x 222 x 250
170 - 200 1200 - 1500 350 - 470
Group 8D Batteries 20.75 x 11.125 x 9.875
527 x 283 x 250
200 - 350 1450 - 2700 460 - 780
Group 24 Batteries 10.25 x 6.8125 x 8.875
260 x 173 x 225
75 - 85 500 - 840 140 - 180
Group 27 Batteries 12.0625 x 6.8125 x 8.875
306 x 173 x 225
66 - 110 640 - 870 140 - 220
Group 31 Batteries 13 x 6.8125 x 9.4375
330 x 173 x 240
75 - 125 600 - 1150 155 - 240

Of course, many other battery groups may be used as not only trolling motor batteries, but as marine, automotive and industrial batteries as well.


BCI battery groups are given in the following charts:

General Purpose Industrial, Automotive and Marine 12V (6 Cells) Batteries

BCI Group Size L (mm) W (mm) H (mm) L (inches) W (inches) H (inches)
21 208 173 222 8 3/16 6 13/16 8 3/4
21R 208 173 222 8 3/16 6 13/16 8 3/4
22F 241 175 211 9 1/2 6 7/8 8 5/16
22HF 241 175 229 9 1/2 6 7/8 9
22NF 240 140 227 9 7/16 5 1/2 8 15/16
22R 229 175 211 9 6 7/8 8 5/16
Group 24 260 173 225 10 1/4 6 13/16 8 7/8
Group 24F 273 173 229 10 3/4 6 13/16 9
Group 24H 260 173 238 10 1/4 6 13/16 9 3/8
Group 24R 260 173 229 10 1/4 6 13/16 9
Group 24T 260 173 248 10 1/4 6 13/16 9 3/4
25 230 175 225 9 1/16 6 7/8 8 7/8
26 208 173 197 8 3/16 6 13/16 7 3/4
26R 208 173 197 8 3/16 6 13/16 7 3/4
Group 27 306 173 225 12 1/16 6 13/16 8 7/8
Group 27F 318 173 227 12 1/2 6 13/16 8 15/16
Group 27H 298 173 235 11 3/4 6 13/16 9 1/4
29NF 330 140 227 13 5 1/2 8 15/16
33 338 173 238 13 5/16 6 13/16 9 3/8
34 260 173 200 10 1/4 6 13/16 7 7/8
34R 260 173 200 10 1/4 6 13/16 7 7/8
35 230 175 225 9 1/16 6 7/8 8 7/8
36R 263 183 206 10 3/8 7 1/4 8 1/8
40R 277 175 175 10 15/16 6 7/8 6 7/8
41 293 175 175 11 3/16 6 7/8 6 7/8
42 243 173 173 9 5/16 6 13/16 6 13/16
43 334 175 205 13 1/8 6 7/8 8 1/16
45 240 140 227 9 7/16 5 1/2 8 15/16
46 273 173 229 10 3/4 6 13/16 9
47 246 175 190 9 11/16 6 7/8 7 1/2
48 306 175 192 12 1/16 6 7/8 7 9/16
49 381 175 192 15 6 7/8 7 3/16
50 343 127 254 13 1/2 5 10
51 238 129 223 9 3/8 5 1/16 8 13/16
51R 238 129 223 9 3/8 5 1/16 8 13/16
52 186 147 210 7 5/16 5 13/16 8 1/4
53 330 119 210 13 4 11/16 8 1/4
54 186 154 212 7 5/16 6 1/16 8 3/8
55 218 154 212 8 5/8 6 1/16 8 3/8
56 254 154 212 10 6 1/16 8 3/8
57 205 183 177 8 1/16 7 3/16 6 15/16
58 255 183 177 10 1/16 7 3/16 6 15/16
58R 255 183 177 10 1/16 7 3/16 6 15/16
59 255 193 196 10 1/16 7 5/8 7 3/4
60 332 160 225 13 1/16 6 5/16 8 7/8
61 192 162 225 7 9/16 6 3/8 8 7/8
62 225 162 225 8 7/8 6 3/8 8 7/8
63 258 162 225 10 3/16 6 3/8 8 7/8
64 296 162 225 11 11/16 6 3/8 8 7/8
65 306 190 192 12 1/16 7 1/2 7 9/16
70 208 179 196 8 3/16 7 1/16 7 11/16
71 208 179 216 8 3/16 7 1/16 8 1/2
72 230 179 210 9 1/16 7 1/16 8 1/4
73 230 179 216 9 1/16 7 1/16 8 1/2
74 260 184 222 10 1/4 7 1/4 8 3/4
75 230 179 196 9 1/16 7 1/16 7 11/16
76 334 179 216 13 1/8 7 1/16 8 1/2
78 260 179 196 10 1/4 7 1/16 7 11/16
85 230 173 203 9 1/16 6 13/16 8
86 230 173 203 9 1/16 6 13/16 8
90 246 175 175 9 11/16 6 7/8 6 7/8
91 280 175 175 11 6 7/8 6 7/8
92 317 175 175 12 1/2 6 7/8 6 7/8
93 354 175 175 15 6 7/8 6 7/8
94R 315 175 190 12 3/8 6 7/8 7 1/2
95R 394 175 190 15 9/16 6 7/8 7 1/2
96R 242 173 175 9 9/16 6 13/16 6 7/8
97R 252 175 190 9 15/16 6 7/8 7 1/2
98R 283 175 190 11 3/16 6 7/8 7 1/2
99 207 175 175 8 1/8 6 7/8 6 7/8
99R 210 175 175 8 1/4 6 7/8 6 7/8
100 260 179 188 10 1/4 7 1/16 7 3/8
101 260 179 170 10 1/4 7 1/16 6 11/16
121R 208 177 215 8 1/4 7 8 1/2
124 265 175 214 10 7/16 6 7/8 8 7/16
124R 262 177 218 10 3/8 7 8 5/16
151R 188 125 225 7 3/8 4 15/16 8 7/8

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

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

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

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

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

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

Electric Vehicle 6 V Batteries (3 Cells)

BCI Group Size L (mm) W (mm) H (mm) L (inches) W (inches) H (inches)
GC2 264 183 270 10 3/8 7 3/16 10 5/8
GC2H 264 183 295 10 3/8 7 3/16 11 5/8

Electric Vehicle 8 V Batteries (4 Cells)

BCI Group Size L (mm) W (mm) H (mm) L (inches) W (inches) H (inches)
GC8 264 183 277 10 3/8 7 3/16 10 7/8
GC8H 264 183 295 10 3/8 7 3/16 11 5/8

Electric Vehicle 12 V Batteries (6 Cells)

BCI Group Size L (mm) W (mm) H (mm) L (inches) W (inches) H (inches)
GC12 327 183 277 12 7/8 7 3/16 10 7/8

General Purpose 12 V Batteries (6 Cells)

BCI Group Size L (mm) W (mm) H (mm) L (inches) W (inches) H (inches)
U1 197 132 186 7 3/4 5 3/16 7 5/16
U1R 197 132 186 7 3/4 5 3/16 7 5/16
U2 160 132 181 6 5/16 5 3/16 7 1/8

 


Here is the list of our battery BCI Groups articles, ordered according to the date added or modified:

BCI Group 24 Batteries

vmaxtanks mr 107 w200pxBCI Group 24 batteries are a very popular mid-size battery group, with batteries commonly used in deep-cycle and dual-purpose applications and less as starting batteries.

However, submodel 24F is often used as starting/cranking and dual-purpose battery in cars, trucks, boats, and in industrial applications as mid-range heavy-duty battery required to provide high starting currents, but also to power electric loads for longer period of time.

Updated: October 20, 2020.

BCI Group 4D, 6D, and 8D Batteries

vmaxtanks xtr4d 200 w200pxBCI Group 4D, 6D, and 8D batteries are large and heavy, but also rather powerful batteries that are able to store large amounts of energy and are thus often used in high-demanding applications including off-the-grid systems, backup units for security and medical devices, electric carts and vehicles, as high-capacity electric trolling motor batteries, as RV house batteries, etc.

BCI Group 4D, 6D, and 8D batteries feature the same length, very similar height, but they differ in width. However, some manufacturers label their batteries as, for example, '4D' batteries although their batteries belong to '6D' batteries and similar. That is the reason one should always check the battery's actual size, not just the BCI battery group.

Updated: September 10, 2020.

BCI Group 31 Dual Purpose and Deep Cycle Batteries

odyssey 31m pc2150 w200pxBCI Group 31 batteries are very popular marine, automotive and industrial batteries - they are mid-size batteries offering good capacity and high starting currents at an acceptable weight.

BCI Group 31 are mostly lead-acid batteries optimized for deep cycle or dual-purpose applications, but lithium-ion batteries are also present, especially as LiFePO4 deep-cycle batteries.

Updated: July 19, 2020.

BCI Group 27 Batteries

vmaxtanks mr 127 w200BCI Group 27 batteries are medium to large in size batteries, commonly used in automotive, marine, and industrial applications where BCI Group 31 batteries are slightly too large and BCI Group are too small to be able to provide enough power or store enough energy.

BCI Group 27 batteries are used in both cyclic and standby/float applications with Sealed Lead-Acid (SLA) Absorbent Glass Mat (AGM) batteries being the most common. For applications where lightweight design and a large number of charging/discharging cycles are required, Lithium Iron Phosphate (LiFePO4) batteries are becoming more and more popular.

Published: June 2, 2020.

Go to top