Automotive Battery Sizes Chart

Look up common BCI car and light-truck battery group sizes, compare case dimensions in inches or millimeters, and cross-reference H/LN and T/LBN size names.

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BCI dimensional reference

Car Battery Group Size Chart

Need a size fast? Search the BCI group printed on the battery—such as 24F, 35, 48, 65, or 94R—or search a cross-reference such as H6 or H7. The table shows maximum overall case dimensions, not vehicle-specific replacement approval.

Swipe the chart sideways for DIN/EN aliases and terminal details.

Common BCI passenger-car and light-commercial 12 V battery groups. Dimensions are maximum overall length × width × height. Decimal inches are calculated from the BCI millimeter dimensions.
							DIN / EN reference	Post / terminal
21	8.19	6.81	8.74	208	173	222	—	Top — A, A2
21R	8.19	6.81	8.74	208	173	222	—	Top — A, A2
22F	9.49	6.89	8.31	241	175	211	—	Top — A
24	10.24	6.81	8.86	260	173	225	—	Top — A, A2
24F	10.75	6.81	9.02	273	173	229	—	Top — A, A2
25	9.06	6.89	8.86	230	175	225	—	Top — A, A2
26	8.19	6.81	7.76	208	173	197	—	Top — A, A2
26R	8.19	6.81	7.76	208	173	197	—	Top — A
27	12.05	6.81	8.86	306	173	225	—	Top — A, A2
27F	12.52	6.81	8.94	318	173	227	—	Top — A, A2
27R	12.05	6.81	8.86	306	173	225	—	Top — A, A2
34	10.24	6.81	7.87	260	173	200	—	Top — A
34R	10.24	6.81	7.87	260	173	200	—	Top — A
35	9.06	6.89	8.86	230	175	225	—	Top — A, A2
40R	10.94	6.89	6.89	278	175	175	T6 / LBN3	Top — A, A1
41	11.54	6.89	6.89	293	175	175	T65	Top — A, A1
42	9.53	6.89	6.89	242	175	175	T5 / LBN2	Top — A, A1
47	9.53	6.89	7.48	242	175	190	H5 / LN2	Top / special — A, A1, F
48	10.94	6.89	7.48	278	175	190	H6 / LN3	Top — A, A1, A2
49	13.90	6.89	7.48	353	175	190	H8 / LN5	Top — A, A1, A2
51	9.37	5.08	8.78	238	129	223	—	Top — A, A2
51R	9.37	5.08	8.78	238	129	223	—	Top — A, A2
58	10.04	7.20	6.97	255	183	177	—	Top — A
58R	10.04	7.20	6.97	255	183	177	—	Top — A
65	12.05	7.56	7.56	306	192	192	—	Top — A
75	9.06	7.09	7.32	230	180	186	—	Side — S
78	10.24	7.09	7.32	260	180	186	—	Side — S
85	9.06	6.81	7.99	230	173	203	—	Top — A
86	9.06	6.81	7.99	230	173	203	—	Top — A
90	9.53	6.89	6.89	242	175	175	T5 / LBN2	Top — A1, A2
91	10.94	6.89	6.89	278	175	175	T6 / LBN3	Top — A1, A2
92	12.40	6.89	6.89	315	175	175	T7 / LBN4	Top — A1, A2
93	13.90	6.89	6.89	353	175	175	T8 / LBN5	Top — A1, A2
94R	12.40	6.89	7.48	315	175	190	H7 / LN4	Top — A1, A2
95R	15.51	6.89	7.48	394	175	190	H9 / LN6	Top — A1, A2
96R	9.53	6.89	6.89	242	175	175	—	Top — A, A1
97R	9.92	6.89	7.48	252	175	190	H5 / LN2	Top — A1, A2
98R	11.14	6.89	7.48	283	175	190	H6 / LN3	Top — A1, A2
99	8.15	6.89	6.89	207	175	175	T4 / LBN1	Top — A1
99R	8.15	6.89	6.89	207	175	175	T4 / LBN1	Top — A1
101	10.24	7.05	6.69	260	179	170	—	Side — S
102R	8.15	6.89	5.47	207	175	139	V4	Top — A
140R	8.15	6.89	7.48	207	175	190	H4 / LN1	Top — A
148	10.94	6.89	7.48	278	175	190	H6 / LN3	Top — A1, A2
151R	7.40	4.92	8.86	188	125	225	—	Top — A
153R	6.89	6.89	7.48	175	175	190	H3 / LN0	Top — A1, A2

Terminal codes: A/A1/A2/A3 are top-post configurations; S is side terminal. Group 75’s BCI maximum height includes raised quarter-cover designs; BCI notes that a flat-top version can be about 10 mm (3/8 in) lower. Cross-references such as H6/LN3 are BCI best-fit dimensional references, not guaranteed interchangeability.

Chart actions and fitment reminder

Use group dimensions to compare physical envelopes only. Before purchase, verify the vehicle’s specified group, terminal position, cable reach, hold-down, chemistry, voltage, CCA/RC requirements, venting, and battery-management-system requirements.

Optional reverse lookup

Find Battery Groups That Fit Your Available Space

Measure the maximum available length, width, and height, then compare those limits with the chart above. A dimensional match does not confirm terminals, hold-downs, cables, chemistry, or electrical requirements.

Measure the case envelope

How to Measure Battery Length, Width, and Height

Use maximum overall dimensions. Measure height to the highest point included in the battery’s specified envelope, and separately verify post position and hold-down features.

Length (L): Longest case dimension
Width (W): Side-to-side case dimension
Height (H): Maximum overall vertical dimension
Also verify: Terminals, polarity, hold-down and cable reach

What a Car Battery Group Size Actually Tells You

BCI group size is a fitment classification, not a simple ranking of battery power. BCI identifies groups using physical dimensions plus terminal arrangement, performance characteristics, chemistry, and other fit-related features. Two batteries can be close in size and still be wrong for the same vehicle.

Dimensions: Maximum overall length, width, and height define the physical envelope.

Terminals: Post style and polarity/orientation must match the vehicle’s cable layout.

Electrical fit: CCA, reserve capacity or amp-hour needs still come from the vehicle/application requirement.

Do not size a replacement battery by dimensions alone

A case that physically fits can still be unsafe or unusable if the posts are reversed, the hold-down does not engage, the cables do not reach, the chemistry is incorrect, or the vehicle requires different electrical performance or battery-management settings.

BCI vs H6, H7, H8, H9, LN and DIN Battery Sizes

European size names are useful search aliases, but they are not one-to-one replacements for every BCI group. BCI’s own DIN/EN reference chart lists H6/LN3 with Groups 48 and 98R and also lists Group 148 at the same H6/LN3 dimensional reference with a different terminal location. Likewise, H5/LN2 appears with both 47 and 97R.

Common BCI ↔ DIN/EN dimensional references

H5 / LN2: BCI 47 and 97R

H6 / LN3: BCI 48, 98R and 148

H7 / LN4: BCI 94R

H8 / LN5: BCI 49

H9 / LN6: BCI 95R

T6 / LBN3: BCI 40R and 91

Use these as cross-reference starting points only. The BCI reference itself describes the mapping as a best-fit estimate; check terminal location, hold-down style, and the vehicle’s required group before installation.

Battery Size Data Sources and Scope

This page is a transformed reference for common passenger-car and light-commercial 12 V groups. It intentionally does not reproduce every BCI data-book column or every battery category.

The controlling dimensional source is Battery Council International. BCI defines group size as more than case dimensions and publishes the passenger-car/light-commercial dimensional tables plus separate DIN/EN cross-reference data. Decimal-inch values on this page are calculated from the BCI millimeter dimensions using 25.4 mm per inch.

Battery Council International — BCI Group SizesDefinition, intended use, and fitment characteristics of BCI group sizes.
Battery Council International — Group Sizes PDFPassenger-car/light-commercial dimensions, terminal configurations, footnotes, and DIN/EN reference chart.
Battery Council International — Vehicle Battery Replacement DataVehicle-specific replacement lookup is a separate task from dimensional group comparison.

Reference details

Publisher: Turn2Engineering
Source checked: October 5, 2026
Canonical dimensions: Millimeters
Displayed inch conversion: in = mm ÷ 25.4
Dimensional meaning: Maximum overall L × W × H
Vehicle fitment: Not established by dimensions alone

Automotive Battery Size FAQ

What battery group size does my car need?

Use current vehicle/OEM information or an authoritative fitment database first. Then use this chart to verify the group dimensions and terminal arrangement. A dimensional match by itself does not establish the correct replacement.

Is H6 the same as Group 48?

Are Group 34 and 34R the same size?

Does a larger BCI group number mean a larger battery?

Can I install a battery if its dimensions fit the tray?