Engineering:Automotive battery sizes

Automotive lead-acid battery case sizes are specified by Battery Council International (BCI) as group numbers by size.

Common battery sizes

BCI#	Volts	Length (in)	Width (in)	Height (in)	Volume	Type	Capacity (AH)	CCA	Notes
U1	12	7.71	5.18	6.89		deep cycle & marine	32
21	?	8.2	6.8	8.8		?	?
21R	?	8.2	6.8	8.8		?	?
22NF	12	9.01	5.43	9.00		deep cycle & marine	55
24	12	11.13	6.60	9.25		deep cycle & marine	80
27	12	12.00	6.63	9.06		deep cycle & marine	90
30H	12	13.00	6.80	9.50		deep cycle & marine	110
31	12	12.90	6.75	9.27		deep cycle & marine	125
4D	12	20.50	8.13	10.00		deep cycle & marine	200
8D	12	20.75	11.00	11.00		deep cycle & marine	245
GC2	6	10.38	7.13	10.88		deep cycle	225
L16	6	11.64	6.95	15.73		deep cycle	400
25	12	9.94	6.81	7.63		starting	44	720
34	12	10.00	6.88	7.63		starting	50	800
34M	12	10.00	6.88	7.94		starting	50	800
34R	12	10.00	6.88	7.63		starting	50	800
34/78	12	10.00	6.88	7.63		starting	50	800
35	12	9.31	6.82	7.82		starting	44	720
75/25	12	9.31	6.82	7.82		starting	44	720

See also

• List of battery sizes

References

• List of Common Battery Case Sizes by BCI Group Number
• Most common battery case sizes, by BCI Group