BCI Battery Size Chart & Guide
BCI Battery Size Chart & Guide
The Battery Council International (BCI) group size system is used to classify batteries based on their physical dimensions, terminal placement, and general application. Choosing the correct BCI group size ensures proper fitment and reliable performance in automotive, marine, RV, golf cart, and backup power applications.
This guide provides a quick reference battery size chart along with explanations to help you choose the right battery for your needs. Many of these sizes are available for in-store pickup in Toronto.
BCI Battery Size Chart
| Group Size | Dimensions (mm / inches) | Common Applications |
|---|---|---|
| Group 24 | 260 x 173 x 225 mm (10.25 x 6.81 x 8.88″) | Marine, RV, deep cycle |
| Group 27 | 306 x 173 x 225 mm (12.06 x 6.81 x 8.88″) | Marine, RV, trolling motor |
| Group 31 | 330 x 173 x 240 mm (13.00 x 6.81 x 9.44″) | Marine, commercial, heavy-duty |
| GC2 (6V) | 262 x 180 x 282 mm (10.30 x 7.10 x 11.10″) | Golf carts, floor scrubbers, solar |
| L16 (903) | 295 x 180 x 424 mm (11.60 x 7.10 x 16.70″) | Solar, off-grid, industrial |
| 8D | 527 x 279 x 254 mm (20.75 x 11.00 x 10.00″) | Heavy equipment, commercial, marine |
| Group 94R (H7 / L4) | 315 x 175 x 190 mm (12.40 x 6.90 x 7.50″) | Automotive (cars, SUVs, light trucks) |
| Group 48 (H6 / L3) | 278 x 175 x 190 mm (11.00 x 6.90 x 7.50″) | Automotive (European vehicles, mid-size cars) |
| Group 49 (H8 / L5) | 353 x 175 x 190 mm (13.90 x 6.90 x 7.50″) | Automotive (luxury vehicles, large engines) |
| U1 | 197 x 132 x 184 mm (7.75 x 5.20 x 7.25″) | Lawn & garden, mobility scooters |
| 22NF | 240 x 140 x 227 mm (9.44 x 5.50 x 8.94″) | Equipment, small industrial, utility |
Tip: Always match your battery’s physical group size first before selecting capacity or battery type.
Looking for a specific battery size? Browse our available batteries by group size below.
Popular BCI Battery Sizes
Group 24 Batteries
Group 24 batteries are commonly used in marine and RV applications. They provide a good balance of size and capacity for moderate power needs.
Group 27 Batteries
Group 27 batteries offer increased capacity compared to Group 24 and are widely used for deep cycle marine and trolling motor applications.
Group 31 Batteries
Group 31 batteries are a popular choice for high-demand marine, commercial, and off-grid systems requiring higher capacity and longer run times.
GC2 Golf Cart Batteries
GC2 batteries are 6V deep cycle batteries typically used in golf carts and industrial equipment. They are often wired in series to create 12V, 24V, or 48V systems.
L16 Batteries (Group 903)
L16 batteries are designed for high-capacity deep cycle applications such as solar energy storage and off-grid systems.
How to Choose the Right BCI Group Size
When selecting a battery, always match the physical group size first to ensure it fits properly in your battery tray. After confirming size, consider the following:
- Capacity (Ah) – Determines how long the battery will run
- Battery Type – AGM, flooded, gel, or lithium
- Application – Starting, deep cycle, or dual purpose
- Terminal Position – Ensures correct cable connections
Common Battery Selection Mistakes
- Choosing the wrong size – Even small differences can prevent proper installation
- Mixing battery types – Can reduce performance and lifespan
- Ignoring terminal layout – May cause connection issues
- Undersizing capacity – Leads to shorter runtime and premature wear
Frequently Asked Questions
What is a BCI group size?
A BCI group size defines the battery’s physical dimensions, terminal placement, and general application category.
Can I use a different group size battery?
It is best to use the recommended group size. Using a different size may cause fitment or performance issues unless the battery tray and connections are modified.
What are GC2 batteries used for?
GC2 batteries are widely used in golf carts, floor scrubbers, industrial equipment and off-grid solar applications. They are built for deep cycle performance, providing reliable power over long periods of use.
What is Group 31 used for?
Group 31 batteries are commonly used in marine, commercial, and heavy-duty applications requiring higher capacity and durability.