In the battery industry, the BCI (Battery Council International) has established a standardized classification system known as “BCI Group Sizes.” These classifications are widely used in automotive, marine, RV, and solar energy storage applications. This article provides an overview of common BCI Group battery sizes, listed in inches.
What Is a BCI Group Size?
A BCI Group Size refers to a standardized battery case size defined by its length, width, and height (in inches), terminal location, and polarity orientation. Different group sizes are designed to fit various applications:
- Group 24 and 27 are common in RVs and boats.
- Group 31 is widely used in commercial vehicles and solar storage.
- Group U1 is often found in lawn mowers, small medical devices, and mobility equipment.
Common BCI Group Sizes (in Inches)
| BCI Group | Length (L) | Width (W) | Height (H) |
|---|---|---|---|
| U1 | 7.7 | 5.1 | 7.3 |
| 22NF | 9.4 | 5.5 | 8.9 |
| 24 | 10.2 | 6.8 | 8.9 |
| 24F | 10.7 | 6.8 | 9.0 |
| 27 | 12.1 | 6.8 | 8.9 |
| 31 | 13.0 | 6.8 | 9.4 |
| 34 | 10.2 | 6.8 | 7.9 |
| 35 | 9.1 | 6.9 | 8.9 |
| 48 (H6) | 12.1 | 6.9 | 7.6 |
| 49 (H8) | 15.0 | 6.9 | 7.6 |
Note: Actual dimensions may vary slightly between manufacturers. Always refer to the product datasheet.
Why Is the Correct BCI Group Size Important?
Choosing the correct BCI Group size ensures proper fitment in your battery compartment and prevents issues such as loose installation or lack of clearance. In addition, terminal configuration and polarity can differ by group, which affects compatibility with your cables and mounting hardware.
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