Lookup & fit check
Find an Automotive Battery Group Size
Search a group or alias, or enter the maximum battery space available.
Qualifying groups
Enter all three maximum dimensions to list qualifying groups.
Reference table
Common Automotive Battery Group Sizes
A limited passenger-car and light-truck dimensional reference, not the complete BCI compilation.
Search above or sort the table. Select up to two groups to compare their case dimensions.
No listed common automotive battery group matches these filters. Clear the search or verify the designation with current vehicle documentation or an official fitment source.
Scroll horizontally to view additional columns and vertically to view additional rows. Column headers remain visible while scrolling.
| Compare | Common alias | Dimensions L × W × H | Fit / terminal note | Copy | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 21 | — | 8.19 | 6.81 | 8.74 | 208 | 173 | 222 | 208 × 173 × 222 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 21R | — | 8.19 | 6.81 | 8.74 | 208 | 173 | 222 | 208 × 173 × 222 mm | Same envelope as 21; R designation requires terminal/polarity verification. | ||
| 22F | — | 9.49 | 6.89 | 8.31 | 241 | 175 | 211 | 241 × 175 × 211 mm | Verify terminal orientation and hold-down. | ||
| 24 | — | 10.24 | 6.81 | 8.86 | 260 | 173 | 225 | 260 × 173 × 225 mm | Common case family; verify terminals and hold-down. | ||
| 24F | — | 10.75 | 6.81 | 9.02 | 273 | 173 | 229 | 273 × 173 × 229 mm | F suffix is part of the group designation; verify application. | ||
| 25 | — | 9.06 | 6.89 | 8.86 | 230 | 175 | 225 | 230 × 175 × 225 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 26 | — | 8.19 | 6.81 | 7.76 | 208 | 173 | 197 | 208 × 173 × 197 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 26R | — | 8.19 | 6.81 | 7.76 | 208 | 173 | 197 | 208 × 173 × 197 mm | Same envelope as 26; terminal arrangement differs. | ||
| 27 | — | 12.05 | 6.81 | 8.86 | 306 | 173 | 225 | 306 × 173 × 225 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 27F | — | 12.52 | 6.81 | 8.94 | 318 | 173 | 227 | 318 × 173 × 227 mm | Verify terminal orientation and hold-down. | ||
| 27R | — | 12.05 | 6.81 | 8.86 | 306 | 173 | 225 | 306 × 173 × 225 mm | Same envelope as 27; terminal arrangement differs. | ||
| 34 | — | 10.24 | 6.81 | 7.87 | 260 | 173 | 200 | 260 × 173 × 200 mm | Same envelope as 34R; verify terminal arrangement. | ||
| 34R | — | 10.24 | 6.81 | 7.87 | 260 | 173 | 200 | 260 × 173 × 200 mm | Same envelope as 34; R designation requires terminal/polarity verification. | ||
| 35 | — | 9.06 | 6.89 | 8.86 | 230 | 175 | 225 | 230 × 175 × 225 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 40R | T6 / LB3 | 10.94 | 6.89 | 6.89 | 278 | 175 | 175 | 278 × 175 × 175 mm | European-reference family; source lists positive terminal on right. | ||
| 41 | T65 | 11.54 | 6.89 | 6.89 | 293 | 175 | 175 | 293 × 175 × 175 mm | European-reference family; verify hold-down and application. | ||
| 47 | H5 / L2 | 9.53 | 6.89 | 7.48 | 242 | 175 | 190 | 242 × 175 × 190 mm | Common European cross-reference; source lists positive terminal on right. | ||
| 48 | H6 / L3 | 10.94 | 6.89 | 7.48 | 278 | 175 | 190 | 278 × 175 × 190 mm | Common European cross-reference; source lists positive terminal on right. | ||
| 49 | H8 / L5 | 13.90 | 6.89 | 7.48 | 353 | 175 | 190 | 353 × 175 × 190 mm | Common European cross-reference; verify exact application. | ||
| 51 | — | 9.37 | 5.08 | 8.78 | 238 | 129 | 223 | 238 × 129 × 223 mm | Narrow case; verify terminal arrangement and hold-down. | ||
| 51R | — | 9.37 | 5.08 | 8.78 | 238 | 129 | 223 | 238 × 129 × 223 mm | Same envelope as 51; terminal arrangement differs. | ||
| 58 | — | 10.04 | 7.20 | 6.97 | 255 | 183 | 177 | 255 × 183 × 177 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 58R | — | 10.04 | 7.20 | 6.97 | 255 | 183 | 177 | 255 × 183 × 177 mm | Same envelope as 58; terminal arrangement differs. | ||
| 65 | — | 12.05 | 7.56 | 7.56 | 306 | 192 | 192 | 306 × 192 × 192 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 85 | — | 9.06 | 6.81 | 7.99 | 230 | 173 | 203 | 230 × 173 × 203 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 86 | — | 9.06 | 6.81 | 7.99 | 230 | 173 | 203 | 230 × 173 × 203 mm | Same listed envelope as 85; designation still matters for application. | ||
| 90 | — | 9.53 | 6.89 | 6.89 | 242 | 175 | 175 | 242 × 175 × 175 mm | European-size family; verify application and terminal arrangement. | ||
| 91 | T6 / LB3 | 10.94 | 6.89 | 6.89 | 278 | 175 | 175 | 278 × 175 × 175 mm | European-reference family; source lists positive terminal on right. | ||
| 92 | T7 / LB4 | 12.40 | 6.89 | 6.89 | 315 | 175 | 175 | 315 × 175 × 175 mm | European-reference family; source lists positive terminal on right. | ||
| 93 | T8 / LB5 | 13.90 | 6.89 | 6.89 | 353 | 175 | 175 | 353 × 175 × 175 mm | European-reference family; source lists positive terminal on right. | ||
| 94R | H7 | 12.40 | 6.89 | 7.48 | 315 | 175 | 190 | 315 × 175 × 190 mm | Common European cross-reference; source lists positive terminal on right. | ||
| 95R | H9 / L6 | 15.51 | 6.89 | 7.48 | 394 | 175 | 190 | 394 × 175 × 190 mm | Common European cross-reference; source lists positive terminal on right. | ||
| 97R | H5 / L2 | 9.92 | 6.89 | 7.48 | 252 | 175 | 190 | 252 × 175 × 190 mm | European-reference family; source lists positive terminal on right. | ||
| 98R | H6 / L3 | 11.14 | 6.89 | 7.48 | 283 | 175 | 190 | 283 × 175 × 190 mm | European-reference family; source lists positive terminal on right. | ||
| 101 | — | 10.24 | 7.05 | 6.69 | 260 | 179 | 170 | 260 × 179 × 170 mm | Verify terminals, hold-down and vehicle fitment. | ||
| 151R | — | 7.40 | 4.92 | 8.86 | 188 | 125 | 225 | 188 × 125 × 225 mm | Compact narrow case; verify application before replacement. |
These are maximum overall case-envelope dimensions from the approved reference source. A battery that fits the measured box can still be wrong for the vehicle because terminal position, cable reach, hold-down, chemistry, electrical ratings, venting, and OEM requirements also matter.
Selected groups
Compare Battery Case Dimensions
Select one or two table rows to compare length, width, and height in the active unit system.
Select up to two battery groups in the table to compare their dimensions.
Dimension reference
How Battery Length, Width, and Height Are Oriented
The diagram follows the first selected group, or shows a generic envelope when nothing is selected.
- Selected group
- Generic
- Length
- —
- Width
- —
- Height
- —
What Automotive Battery Group Size Means
A BCI group number is a fitment classification, not a simple capacity ranking. The group identifies a standardized physical family, while the correct replacement also depends on terminal arrangement, hold-down details, chemistry and electrical performance requirements.
- Size tells you
- The standardized case envelope used to check length, width and height.
- Size does not tell you
- Whether a specific battery meets the vehicle’s required CCA, reserve capacity, chemistry or electronics requirements.
- Suffixes matter
- Designations such as R or F are part of the group identity and can indicate a different terminal arrangement or configuration.
Worked Battery Size Examples
Example 1: Look up Group 94R
Assumption: The existing battery label clearly shows 94R.
Search 94R. The reference row shows a maximum overall envelope of 315 × 175 × 190 mm, approximately 12.40 × 6.89 × 7.48 in.
Interpretation: This confirms the case envelope only. It does not approve a battery for a particular vehicle; verify the OEM fitment, terminals, hold-down, chemistry and required electrical ratings.
Example 2: Check a measured tray
Assumption: A rectangular battery space measures 280 × 176 × 191 mm and the battery cannot be rotated.
Enter those values in the fit finder. A candidate must satisfy all three tests: L ≤ 280 mm, W ≤ 176 mm and H ≤ 191 mm. Extra clearance on one axis cannot compensate for a battery that exceeds another axis.
Sanity check: Even a dimensionally qualifying group can fail because of cable reach, post polarity, hold-down shape or vehicle requirements.
BCI, H/LN, DIN and EN Battery Size Names
European and North American naming systems overlap but are not universally interchangeable. The approved Caterpillar BCI/DIN/EN reference chart lists examples such as Group 47 with H5/L2, Group 48 with H6/L3, Group 49 with H8/L5, Group 94R with H7, and Group 95R with H9/L6. Treat these as reference cross-links, not automatic vehicle-fit approval.
Common Battery Replacement Mistakes
- Choosing a battery because the outer dimensions fit while ignoring terminal polarity and cable reach.
- Assuming a larger group number means a physically larger or more powerful battery.
- Comparing only CCA while ignoring the required chemistry, reserve capacity, venting, hold-down, or vehicle energy-management requirements.
- Treating an H/LN/DIN/EN cross-reference as guaranteed interchangeability.
- Rotating a battery in the tray without confirming that posts, cables, venting and hold-down features remain correct.
Fitment warning
Use this page for dimensional reference and preliminary comparison. Confirm the vehicle’s specified group, terminal position/polarity, hold-down, cable reach, chemistry, voltage, CCA/RC requirements and any battery-management-system requirements with current vehicle or manufacturer fitment information before replacement.
Data Sources, Scope, and Limitations
Limited transformed dimensional reference for common 12 V passenger-car and light-truck groups. Rows with unresolved dimensional conflicts between the approved Caterpillar guide and BCI verification source are omitted.
Battery Council International (BCI) is the controlling industry authority for group-size terminology. Published rows here are limited to the automotive scope in the research handoff and were cross-checked against BCI. Where the approved Caterpillar dimensional guide and BCI verification PDF materially disagreed, the row was withheld rather than averaged. Full BCI table reproduction and bulk CSV export are intentionally not provided.
- Battery Council International — BCI Group SizesDefinition and intended use of BCI group classifications.
- Battery Council International — BCI Group Sizes PDFAuthoritative verification reference; complete table is not reproduced here.
- Caterpillar — Cat Batteries Application GuideBCI Group Sizes and Overall Dimensions, pages 17–18; BCI/DIN/EN Reference Chart, page 20.
- Battery Council International — Vehicle Battery Replacement DataVehicle-specific replacement fitment is a separate data task from dimensional group lookup.
Dataset and Source-Check Details
- Publisher
- Turn2Engineering
- Source checked
- September 4, 2026
- Canonical unit
- Millimeters
- Displayed conversion
- in = mm ÷ 25.4
- Dimensional meaning
- Maximum overall L × W × H
- Missing values
- Em dash (—), never zero-filled
- Rights decision
- Limited transformed reference; no complete BCI reproduction or bulk CSV
- Vehicle fitment
- Not provided; use current OEM/manufacturer/BCI application data
Automotive Battery Size FAQ
Use the vehicle’s current manufacturer/service information or an authoritative fitment database; dimensions alone do not establish the correct replacement group.
Groups 34 and 34R share the same 260 × 173 × 200 mm envelope in both approved dimensional references, but the R designation uses a different assembly/terminal arrangement, so they are not automatically interchangeable.
H6/L3 is a common European reference, but the approved cross-reference lists it with both Group 48 and Group 98R. Use the exact BCI group and verify dimensions, terminal layout, hold-down and vehicle fitment rather than treating H6 as a unique interchange.
No. BCI group numbers are designations rather than a strictly increasing physical-size scale.
Not on dimensions alone; terminal arrangement, hold-down, chemistry, electrical ratings, venting and vehicle-specific requirements can make a dimensionally similar battery unsuitable.
Use the Group Size as a Dimensional Check, Not Final Fitment Approval
Start with the battery group specified for the vehicle. Use this chart to confirm L × W × H, compare nearby groups, or test a measured rectangular space. Before buying or installing a replacement, verify the terminal arrangement, hold-down, cable reach, chemistry and required electrical ratings with current vehicle-specific information.