If you want to find out how many batteries are in your device and what their sizes are, knowing the BCI group size can be a good place start. But this isn’t always enough informationbatteries also vary by: purpose (starting vs deep cycle), cell type(AGM vs gel)and chemistry Primarily lead acidic or nickel metal hydride cells? What kind of terminals does it have?
The battery groups and their dimensions in inches or centimeters are:
Group Size 
Size (Inches) 
Size (cm) 

10.2 x 6.8 x 8.8 
26 x 17.3 x 22.5 

Group 27 Batteries 
12 x 6.8 x 8.8 
30.6 x 17.3 x 22.5 
Group 31 Batteries 
13 x 6.8 x 9.4 
33 x 17.3 x 24 
Group 34 Batteries 
10.2 x 6.8 x 7.8 
26 x 17.3 x 20 
Group 35 Batteries 
9 x 6.8 x 8.8 
23 x 17.5 x 22.5 
Group 51 Batteries 
9.3 x 5 x 8.8 
23.8 x 12.9 x 22.3 
Group 51r Batteries 
9.3 x 5 x 8.8 
23.8 x 12.9 x 22.3 
Group 65 Batteries 
12 x 7.5 x 7.5 
30.6 x 19 x 19.2 
Group 78 Batteries 
10.2 x 7 x 7.6 
26 x 17.9 x 19.6 
There are a few things to check when replacing your battery, including chemistry and electrical features.
Our BCI battery sizing chart below will help you find the right fit for your device.
Group Size 
Size (Inches) 
Size (cm) 

21 
8.1 x 6.8 x 8.7 
20.8 x 17.3 x 22.2 
21R 
8.1 x 6.8 x 8.7 
20.8 x 17.3 x 22.2 
22F 
9.5 x 6.8 x 8.3 
24.1 x 17.5 x 21.1 
22HF 
9.5 x 6.8 x 9 
24.1 x 17.5 x 22.9 
22NF 
9.4 x 5 .5 x 8.9 
24 x 14 x 22.7 
22R 
9 x 6.8 x 8.3 
22.9 x 17.5 x 21.1 
24H 
10.2 x 6.8 x 9.3 
26 x 17.3 x 23.8 
24F 
10.7 x 6.8 x 9 
27.3 x 17.3 x 22.9 
24R 
10.2 x 6.8 x 9 
26 x 17.3 x 22.9 
24T 
10.2 x 6.8 x 9.7 
26 x 17.3 x 24.8 
25 
9 x 6.8 x 8.8 
23 x 17.5 x 22.5 
26 
8.1 x 6.8 x 7.7 
20.8 x 17.3 x 19.7 
26R 
8.1 x 6.8 x 7.7 
20.8 x 17.3 x 19.7 
27 
12 x 6.8 x 8.8 
30.6 x 17.3 x 22.5 
27F 
12.5 x 6.8 x 8.9 
31.8 x 17.3 x 22.7 
27H 
11.7 x 6.8 x 9.2 
29.8 x 17.3 x 23.5 
29NF 
13 x 5.5 x 8.9 
33 x 14 x 22.7 
33 
13.3 x 6.8 x 9.3 
33.8 x 17.3 x 23.8 
34 
10.2 x 6.8 x 7.8 
26 x 17.3 x 20 
34R 
10.2 x 6.8 x 7.8 
26 x 17.3 x 20 
35 
9 x 6.8 x 8.8 
23 x 17.5 x 22.536R 
36R 
10.3 x 7.2 x 8.1 
26.3 x 18.3 x 20.6 
40R 
10.9 x 6.8 x 6.8 
27.7 x 17.5 x 17.5 
41 
11.1 x 6.8 x 6.8 
29.3 x 17.5 x 17.5 
42 
9.3 x 6.8 x 6.8 
24.3 x 17.3 x 17.3 
43 
13.1 x 6.8 x 8 
33.4 x 17.5 x 20.5 
45 
9.4 x 5.5 x 8.9 
24 x 14 x 22.7 
46 
10.7 x 6.8 x 9 
27.3 x 17.3 x 22.9 
47 
9.6 x 6.8 x 7.5 
24.6 x 17.5 x 19 
48 
12 x 6.8 x 7.5 
30.6 x 17.5 x 19.2 
49 
15 x 6.8 x 7.1 
38.1 x 17.5 x 19.2 
50 
13.5 x 5 x 10 
34.3 x 12.7 x 25.4 
51 
9.3 x5 x 8.8 
23.8 x 12.9 x 22.3 
51R 
9.3 x 5 x 8.8 
23.8 x 12.9 x 22.3 
52 
7.3 x 5.8 x 8.2 
18.6 x 14.7 x 21 
53 
13 x 4.6 x 8.2 
33 x 11.9 x 21 
54 
7.3 x 6 x 8.3 
18.6 x 15.4 x 21.2 
55 
8.6 x 6 x 8.3 
21.8 x 15.4 x 21.2 
56 
10 x 6 x 8.3 
25.4 x 15.4 x 21.2 
57 
8 x 7.1 x 6.9 
20.5 x 18.3 x 17.7 
58 
10 x 7.1 x 6.9 
25.5 x 18.3 x 17.7 
58R 
10 x 7.1 x 6.9 
25.5 x 18.3 x 17.7 
59 
10 x 7.6 x 7.7 
25.5 x 19.3 x 19.6 
60 
13 x 6.3 x 8.8 
33.2 x 16 x 22.5 
61 
7.5 x 6.3 x 8.8 
19.2 x 16.2 x 22.5 
62 
8.8 x 6.3 x 8.8 
22.5 x 16.2 x 22.5 
63 
10.1 x 6.3 x 8.8 
25.8 x 16.2 x 22.5 
64 
11.6 x 6.3 x 8.8 
29.6 x 16.2 x 22.5 
65 
12 x 7.5 x 7.5 
30.6 x 19 x 19.2 
70 
8.1 x 7 x 7.6 
20.8 x 17.9 x 19.6 
71 
8.1 x 7 x 8.5 
20.8 x 17.9 x 21.6 
72 
9 x 7 x 8.2 
23 x 17.9 x 21 
73 
9 x 7 x 8.5 
23 x 17.9 x 21.6 
74 
10.2 x 7.2 x 8.7 
26 x 18.4 x 22.2 
75 
9 x 7 x 7.6 
23 x 17.9 x 19.6 
76 
13.1 x 7 x 8.5 
33.4 x 17.9 x 21.6 
78 
10.2 x 7 x 7.6 
26 x 17.9 x 19.6 
85 
9 x 6.8 x 8 
23 x 17.3 x 20.3 
86 
9 x 6.8 x 8 
23 x 17.3 x 20.3 
90 
9.6 x 6.8 x 6.8 
24.6 x 17.5 x 17.5 
91 
11 x 6.8 x 6.8 
28 x 17.5 x 17.5 
92 
12.5 x 6.8 x 6.8 
31.7 x 17.5 x 17.5 
93 
15 x 6.8 x6.8 
35.4 x 17.5 x 17.5 
94R 
12.3 x 6.8 x 7.5 
31.5 x 17.5 x 19 
95R 
15.5 x 6.8 x 7.5 
39.4 x 17.5 x 19 
96R 
9.5 x 6.8 x 6.8 
24.2 x 17.3 x 17.5 
97R 
9.9 x 6.8 x 7.5 
25.2 x 17.5 x 1998R 
98R 
11.1 x 6.8 x 7.5 
28.3 x 17.5 x 19 
99 
8.1 x 6.8 x 6.8 
20.7 x 17.5 x 17.5 
99R 
8.2 x 6.8 x 6.8 
21 x 17.5 x 17.5 
100 
10.2 x 7 x 7.3 
26 x 17.9 x 18.8 
101 
10.2 x 7 x 6.6 
26 x 17.9 x 17 
121R 
8.2 x 7 x 8.5 
20.8 x 17.7 x 21.5 
124 
10.4 x 6.8 x 8.4 
26.5 x 17.5 x 21.4 
124R 
10.3 x 7 x 8.3 
26.2 x 17.7 x 21.8 
151R 
7.3 x 4.9 x 8.8 
18.8 x 12.5 x 22.5 
Car Battery Group Size Chart
Group Size 
Size (Inches) 
Size (cm) 

1 
9.1 x 7.1 x 9.3 
23.2 x 18.1 x 23.8 
2 
10.3 x 7.1 x 9.3 
26.4 x 18.1 x 23.8 
2E 
19.4 x 4.1 x 9.1 
49.2 x 10.5 x 23.2 
2N 
10 x 5.5 x 8.9 
25.4 x 14.1 x 22.7 
17HF 
7.3 x 6.8 x 9 
18.7 x 17.5 x 22.9 
19L 
8.5 x 7 x 7.5 
21.6 x 17.8 x 19.1 
Commercial/Industrial Batteries Group Size Chart
Group Size 
Cells 
Size (Inches) 
Size (cm) 

3EE 
6 
19.3 x 4.3 x 8.8 
49.1 x 11.1 x 22.5 
3ET 
6 
19.3 x 4.3 x 9.8 
49.1 x 11.1 x 24.9 
4D 
6 
20.7 x 8.7 x 9.8 
52.7 x 22.2 x 25 
4DLT 
6 
20 x 8.1 x 7.9 
50.8 x 20.8 x 20.2 
6D 
6 
20.7 x 10 x 10.2 
52.7 x 25.4 x 26 
8D 
6 
20.7 x 11.1 x 9.8 
52.7 x 28.3 x 25 
12T 
6 
7 x 6.9 x 7.9 
17.9 x 17.7 x 20.2 
28 
6 
10.3 x 6.8 x 9.4 
26.1 x 17.3 x 24 
29H 
6 
13.1 x 6.7 x 9.1 
33.4 x 17.1 x 23.2 
30H 
6 
13.5 x 6.8 x 9.2 
34.3 x 17.3 x 23.5 
31 
6 
13 x 6.8 x 9.4 
33 x 17.3 x 24 
3 
3 
11.7 x 7.1 x 9.3 
29.8 x 18.1 x 23.8 
3EH 
3 
19.3 x 4.3 x 9.8 
49.1 x 11.1 x 24.9 
4 
3 
13.1 x 7.1 x 9.3 
33.4 x 18.1 x 23.8 
4EH 
3 
19.3 x 5 x 9.8 
49.1 x 12.7 x 24.9 
5D 
3 
13.7 x 7.1 x 9.3 
34.9 x 18.1 x 23.8 
7D 
3 
16.2 x 7.1 x 9.3 
41.3 x 18.1 x 23.8 
Electric Vehicle Group Size Chart
Group Size 
Cells 
Volts 
Size (Inches) 
Size (cm) 

GC2 
3 
6V 
10.3 x 7.1 x 10.6 
26.4 x 18.3 x 27 
GC2H 
4 
6V 
10.3 x 7.1 x 11.6 
26.4 x 18.3 x 29.5 
GC8 
6 
8V 
10.3 x 7.1 x 10.8 
26.4 x 18.3 x 27.7 
GC8H 
6 
8V 
10.3 x 7.1 x 11.6 
26.4 x 18.3 x 29.5 
GC12 
6 
12V 
12.8 x 7.1 x 10.8 
32.7 x 18.3 x 27.7 
The difference between a few BCI battery groups can be just one inch, but it’s enough for safety reasons. If you have another type of device that uses these types please make sure to check with professionals before switching out your batteries so as not cause any damage or injuries!
BCI Battery Groups, and DIN and EN Codes – Cross Reference Chart
The following chart lists all of the most popular BCI battery groups, their DIN and EN equivalent codes:
BCI Group 
DIN 
EN 
Size (cm) 

40R 
T6, LB3 
66LB 
27.8 x 17.5 x 17.5 
41 
T65 
54LB 
29.3 x 17.5 x 17.5 
42 
T5, LB2 
45LB 
24.2 x 17.5 x 17.5 
47 
H5, L2 
55L2 
24.2 x 17.5 x 19 
48 
H6, L3 
66L3 
27.8 x 17.5 x 19 
49 
H8, L5 
88L5 
35.4 x 17.5 x 19 
90 
T5, LB2 
45LB 
24.2 x 17.5 x 17.5 
91 
T6, LB3 
66LB 
27.8 x 17.5 x 17.5 
92 
T7, LB4 
77LB 
31.5 x 17.5 x 17.5 
93 
T8, LB5 
88LB 
35.4 x 17.5 x 17.5 
94R 
H7, L4 
77L4 
31.5 x 17.5 x 19 
95R 
H9, L6 
– 
39.4 x 17.5 x 19 
97R 
H5, L2 
55L2 
25.2 x 17.5 x 19 
98R 
H6, L3 
66L3 
28.3 x 17.5 x 19 
99 
T4, LB1 
36LB 
20.7 x 17.5 x 17.5 
99R 
T4, LB1 
36LB 
21 x 17.5 x 17.5 
The battery group industry is a tough one to navigate, with so many different manufacturers and models. Luckily we have this crossreference chart that lists all of the dimensions for you! Take note though – not only do these batteries include their size in millimeters but also which terminals they’re compatible with as well as what type base hold down or lifting edge mechanism may be present on each individual cell slot.”
The BCI Group 48 batteries have dimensions of 306 x 175x192mm with the positive terminal located on right side while comparable DIN/EN counterparts are H6(278×175 mm), L3 (276) & 66L 3(280). However 98R version has similar size but differs in shape making it more appropriate for variousated applications where higher current will be required such as electric vehicles or solar power plants among others.
The BCI group 48 is a maintenance free Sealed Lead Acid (SLA) battery which stands for Absorbent Glass Mat separator and is notably known as EFB. This lead acid battery will be the best suitable options with respect to cost and performance when it comes to deep cycle applications such as UPS systems, solar power plants and electric vehicles.
Although there are many comparisons with respect to amp hour ratings, life expectancy and deep cycling capabilities of both 48V and 12V batteries, the bottom line would be that if you need more capacity then go for 96V or 144V system as increasing voltage will increase both capacity as well as load supportability without sacrificing speed.