Understanding battery group size dimensions is essential when selecting the right battery for your RV, marine, or golf cart setup. With standardized sizes defined by BCI, choosing the correct group size ensures proper fit, optimal performance, and reliable power.
In this guide, we provide a complete battery size chart, real-world application examples, and practical tips to help you confidently choose the best battery for your needs.
- Part1: Battery Group Size Dimensions Chart
- Part2: What does Battery Group Size Dimensions mean?
- Part3: Battery Group Size Dimensions for RV, Marine,Golf Cart
- Part4: How to Choose Right Battery Group Size Dimensions?
- Part5: LiTime Battery Group Size Dimensions Comparision
- Part6: FAQs About Battery Group Size Dimensions
Part1: Battery Group Size Dimensions Chart
Below is a comprehensive battery group size dimensions chart including both inches and centimeters, covering common sizes such as group size 24, 27, 31, 34, 35, 48, 65, and more.
| Group Size | Dimensions (L × W × H) Inches | Dimensions (L × W × H) cm |
|---|---|---|
| Group 24 | 10.25 × 6.81 × 8.88 | 26.0 × 17.3 × 22.5 |
| Group 24F | 10.75 × 6.81 × 8.88 | 27.3 × 17.3 × 22.9 |
| Group 26 | 8.19 × 6.81 × 7.75 | 20.8 × 17.3 × 19.7 |
| Group 27 | 12.06 × 6.81 × 8.88 | 30.6 × 17.3 × 22.5 |
| Group 31 | 13.00 × 6.72 × 9.44 | 33.0 × 17.3 × 24.0 |
| Group 34 | 10.25 × 6.81 × 7.88 | 26.0 × 17.3 × 20.0 |
| Group 35 | 9.06 × 6.89 × 8.88 | 23.0 × 17.5 × 22.5 |
| Group 48 | 11.94 × 6.94 × 7.50 | 27.8 × 17.5 × 19.0 |
| Group 51 | 9.38 × 5.06 × 8.75 | 23.8 × 12.9 × 22.3 |
| Group 58 | 10.06 × 7.19 × 6.94 | 25.6 × 18.3 × 17.7 |
| GC2 | 10.38 × 7.19 × 10.88 | 26.4 × 18.3 × 27.7 |
| GC8 | 10.38 × 7.19 × 10.88 | 26.4 × 18.3 × 27.7 |
| Group 65 | 12.06 × 7.56 × 7.56 | 30.6 × 19.2 × 19.2 |
| Group 78 | 10.25 × 7.06 × 7.31 | 26.0 × 18.30× 18.6 |
| Group 8D | 20.75 × 11.13 × 9.81 | 52.7 × 28.3 × 25.0 |
Note: Dimensions may vary slightly by manufacturer. Always verify exact measurements before installation.
Part2: What does Battery Group Size Dimensions mean?
Battery Group Size Dimensions refers to the standardized physical size of a battery, defined by its length, width, and height. These sizes are set by the Battery Council International (BCI) to ensure batteries fit properly in specific vehicles or equipment.
Each group size (such as Group 24, 27, or 31) represents a specific set of dimensions, but it does not directly indicate capacity or performance. Instead, it ensures compatibility with battery trays, mounting spaces, and terminal positions.
Part3: Battery Group Size Dimensions for RV, Marine,Golf Cart
Battery Group Size Dimensions for RV
Below are typical RV battery tray or compartment dimensions, which determine what battery group sizes can fit:
| RV Battery Space Type | Dimensions (L × W × H) Inches | Dimensions (L × W × H) cm |
|---|---|---|
| Single Battery Tray | 10.5 × 7.5 × 10 in | 26.7 × 19.1 × 25.4 cm |
| Dual Battery Tray | 21 × 7.5 × 10 in | 53.3 × 19.1 × 25.4 cm |
| Large Battery Box | 14 × 8 × 11 in | 35.6 × 20.3 × 28.0 cm |
| Tongue Box (Travel Trailer) | 24 × 12 × 12 in | 61.0 × 30.5 × 30.5 cm |
Based on the above space, the following battery group size dimensions are commonly used in RV applications:
| Group Size | Dimensions (L × W × H) Inches | Dimensions (L × W × H) cm | RV Suitability |
|---|---|---|---|
| Group 24 | 10.25 × 6.81 × 8.88 in | 26.0 × 17.3 × 22.5 cm | Fits most single trays |
| Group 27 | 12.06 × 6.81 × 8.88 in | 30.6 × 17.3 × 22.5 cm | More capacity, common upgrade |
| Group 31 | 13.00 × 6.72 × 9.44 in | 33.0 × 17.3 × 24.0 cm | Best for extended off-grid use |
| GC2 (6V) | 10.38 × 7.19 × 10.88 in | 26.4 × 18.3 × 27.7 cm | Used in pairs for 12V systems |
Battery Group Size Dimensions for Marine
Below are typical marine battery compartment or battery box dimensions found in boats:
| Marine Battery Space Type | Dimensions (L × W × H) Inches | Dimensions (L × W × H) cm |
|---|---|---|
| Small Battery Box | 11 × 7 × 10 in | 28.0 × 17.8 × 25.4 cm |
| Standard Battery Tray | 13 × 7.5 × 10 in | 33.0 × 19.1 × 25.4 cm |
| Dual Battery Compartment | 26 × 7.5 × 10 in | 66.0 × 19.1 × 25.4 cm |
| Large Marine Battery Box | 14 × 8 × 11 in | 35.6 × 20.3 × 28.0 cm |
Based on these space dimensions, the following battery group size dimensions are commonly used in marine applications:
| Group Size | Dimensions (L × W × H) Inches | Dimensions (L × W × H) cm | Marine Application |
|---|---|---|---|
| Group 24 | 10.25 × 6.81 × 8.88 in | 26.0 × 17.3 × 22.5 cm | Small boats, starter batteries |
| Group 27 | 12.06 × 6.81 × 8.88 in | 30.6 × 17.3 × 22.5 cm | Deep cycle, general marine use |
| Group 31 | 13.00 × 6.72 × 9.44 in | 33.0 × 17.3 × 24.0 cm | Trolling motors, high capacity |
| Group 34 | 10.25 × 6.81 × 7.88 in | 26.0 × 17.3 × 20.0 cm | Compact starting batteries |
| Group 8D | 20.75 × 11.13 × 9.81 in | 52.7 × 28.3 × 25.0 cm | Large boats, heavy-duty systems |
Battery Group Size Dimensions for Golf Cart
Below are typical golf cart battery tray dimensions, depending on system voltage (36V or 48V) and battery configuration:
| Golf Cart System | Dimensions (L × W × H) Inches | Dimensions (L × W × H) cm |
|---|---|---|
| 36V (6×6V batteries) | 20–22 × 10–12 × 10–12 in | 50–56 × 25–30 × 25–30 cm |
| 48V (6×8V batteries) | 20–22 × 10–12 × 10–12 in | 50–56 × 25–30 × 25–30 cm |
| 48V (4×12V batteries) | 26–30 × 10–12 × 10–12 in | 66–76 × 25–30 × 25–30 cm |
Golf carts typically use GC (Golf Cart) battery sizes rather than standard automotive groups, but some 12V group sizes are also used:
| Group Size | Dimensions (L × W × H) Inches | Dimensions (L × W × H) cm | Golf Cart Application |
|---|---|---|---|
| GC2 (6V) | 10.38 × 7.19 × 10.88 in | 26.4 × 18.3 × 27.7 cm | Most common for 36V/48V systems |
| GC8 (8V) | 10.38 × 7.19 × 10.88 in | 26.4 × 18.3 × 27.7 cm | Used in 48V systems |
| Group 27 (12V) | 12.06 × 6.81 × 8.88 in | 30.6 × 17.3 × 22.5 cm | Alternative 12V setups |
| Group 31 (12V) | 13.00 × 6.72 × 9.44 in | 33.0 × 17.3 × 24.0 cm | Higher capacity lithium upgrades |
Part4: How to Choose Right Battery Group Size Dimensions?
- Clearly define your application (RV, marine, golf cart, or solar) and measure the available battery space (length, width, and height). This ensures the battery will physically fit without installation issues.
- Consider how battery size relates to capacity. Larger group sizes (such as Group 27 or 31) generally provide higher energy capacity and longer runtime, while smaller sizes (like Group 24) are more compact but offer less power.
- Match the selected battery group size dimensions to your system requirements. If replacing an existing battery, using the same group size ensures easy installation. If upgrading, make sure the new size still fits your battery compartment.
- Compare Lithium vs Lead-Acid dimensions. Lithium (LiFePO4) batteries often have similar or slightly smaller sizes but deliver significantly higher usable capacity, lighter weight, and longer lifespan.Upgrading to a lithium battery is highly recommended for better performance, efficiency, and long-term value.
Part5: LiTime Battery Group Size Dimensions Comparision
| Size (Group) | Dimensions (Approx) | Voltage / BMS | Capacity | Applications |
|---|---|---|---|---|
| Group 24 lithium battery | 10.23 × 6.61 × 8.22 in | 12V / 100A BMS | 100Ah (1280Wh) | RV, marine, solar, off-grid, trolling motor |
| Group 27 lithium battery | 12.13 × 6.69 × 8.31 in | 12V / 100A BMS | 100Ah (1280Wh) | RV, marine, trolling motor, solar |
| Group 31 lithium battery | 13 × 6.77 × 8.5 in | 12V / 150A BMS | 165Ah (~2112Wh) | RV, marine |
| Group 8D lithium battery | 20.47 × 10.59 × 8.66 in | 12V / 250A BMS | 460Ah (~5888Wh) | RV,marine, solar storage, off-grid, home backup |
Part6: FAQs About Battery Group Size Dimensions
What are the most common battery group sizes?
The most common battery group sizes are Group 24, Group 27, and Group 31.
These sizes are widely used across RV, marine, and solar applications because they offer a good balance between physical dimensions and capacity. Group 24 is compact and suitable for basic needs, Group 27 provides more capacity for moderate use, and Group 31 offers the highest capacity among the three, making it ideal for longer runtime and higher power demands.
Are group 27 and 31 batteries the same size?
No, Group 27 and Group 31 batteries are not the same size.
While both have similar widths and heights, Group 31 batteries are longer than Group 27. This extra length allows Group 31 batteries to store more energy and deliver higher capacity.
Can I use a group 27 battery in place of a group 24?
Yes, you can use a Group 27 battery instead of a Group 24 if space allows.
Group 27 batteries are larger and provide more capacity than Group 24, making them a common upgrade option. However, you must ensure that your battery compartment has enough space to accommodate the larger size and that terminal placement remains compatible. Resd more on Group 24 vs Group 27 batteries.
Conclusion
Choosing the right battery group size dimensions is about more than just fit—it directly impacts performance, runtime, and system reliability. By understanding standard sizes, considering your specific application, you can make a smarter decision.
Upgrading to LiTime LiFePO4 lithium batteries further enhances efficiency, offering longer lifespan, lighter weight, and greater usable capacity, making them an ideal solution for modern power needs.
