What is the size of a group 27 battery?

A Group 27 battery typically measures 12.4 inches (L) x 6.8 inches (W) x 8.9 inches (H) and weighs 50-70 lbs. It delivers 80-110 Ah capacity and 800-1,000 CCA, making it ideal for marine, RV, and commercial vehicles. Its size balances power and space efficiency, fitting standardized trays while supporting high-demand electrical systems.

What Is a Group Size 24 Battery?

How Do Group 27 Battery Dimensions Compare to Other Battery Sizes?

Group 27 batteries are larger than Group 24 (10.3″ L x 6.8″ W x 9.4″ H) but smaller than Group 31 (13″ L x 6.8″ W x 9.4″ H). This mid-size design offers higher capacity (80-110 Ah) than Group 24 (70-85 Ah) while maintaining a manageable footprint for vehicles and boats with moderate space constraints.

Battery Group	Length (in)	Width (in)	Height (in)	Typical Use Cases
24	10.3	6.8	9.4	Small trucks, compact RVs
27	12.4	6.8	8.9	Marine, mid-size RVs
31	13.0	6.8	9.4	Heavy-duty trucks

When upgrading from Group 24 to 27, users gain 15-25% more capacity while maintaining similar terminal configurations. However, the 2.1-inch length increase requires verifying tray dimensions. For marine applications, the reduced height of Group 27 (8.9″ vs 9.4″ in Group 31) often proves advantageous in tight engine compartments. Industrial users frequently pair two Group 27 batteries in parallel to create 160-220 Ah systems without exceeding weight limits of mobile equipment racks.

What Are the Common Applications for a Group 27 Battery?

Group 27 batteries power marine vessels, RVs, trucks, and solar storage systems. Their 800-1,000 CCA and deep-cycle capabilities ensure reliable starts and sustained energy for trolling motors, winches, and auxiliary electronics. They’re also used in off-grid setups due to their balance of size and reserve capacity (180-240 minutes).

How Much Does a Group 27 Battery Weigh?

Group 27 batteries weigh between 50-70 lbs, depending on construction. Flooded lead-acid versions are heavier (65-70 lbs), while AGM variants are lighter (50-60 lbs). Weight correlates with plate thickness and electrolyte volume, impacting durability and cycle life in applications like marine use or frequent deep discharges.

What Is the Reserve Capacity of a Group 27 Battery?

A Group 27 battery typically has a reserve capacity (RC) of 180-240 minutes at 25 amps. This measures how long it can run essential electronics without recharging, critical for RVs and boats. AGM models often exceed 200 minutes RC due to low internal resistance and higher active material utilization.

Which Vehicles Are Compatible with Group 27 Batteries?

Group 27 batteries fit diesel trucks (Ford F-250, Ram 2500), marine craft (Yamaha boats, Boston Whalers), and RVs (Winnebago, Airstream). Compatibility depends on tray size (≥12.4″ x 6.8″) and terminal placement. Always check OEM specifications to avoid clearance issues with hoods or brackets.

In marine applications, Group 27 batteries are commonly used as dual-purpose starting/house batteries in vessels up to 30 feet. Their SAE post terminals accommodate standard marine cabling, while the BCI group standardization ensures replacement availability. For RV owners, the 8.9-inch height allows installation in side compartments with limited vertical space. Commercial truck operators appreciate the balance between cold-cranking amps and cycle life – a typical Group 27 battery can handle 300+ engine starts per year while powering auxiliary lighting and GPS systems.

How Does Temperature Affect Group 27 Battery Performance?

Cold reduces cranking amps by 30-40% at 0°F, while heat above 100°F accelerates sulfation. AGM Group 27 batteries handle -40°F to 140°F better than flooded types, with thicker plates and sealed designs. Insulated battery boxes or thermal wraps mitigate temperature extremes in marine/RV applications.

Can You Use a Group 27 Battery for Solar Power Storage?

Yes. Group 27 deep-cycle batteries provide 80-110 Ah for solar systems, supporting 1-2 days of backup power. AGM models are preferred for their 500+ cycles at 50% depth of discharge (DoD). Pair with a 100W solar panel and 30A MPPT charge controller for optimal off-grid performance.

“Modern Group 27 AGM batteries now integrate carbon-enhanced plates, boosting charge acceptance by 40% versus traditional designs. This makes them ideal for dual-purpose marine use, where rapid recharging between starts and deep cycling for trolling motors is critical. Always match the battery’s BCI group size to the manufacturer’s tray specifications to prevent vibration damage.” — Industry Expert, Power Storage Solutions

Conclusion

Group 27 batteries offer a versatile balance of size (12.4″ x 6.8″ x 8.9″), power (800-1,000 CCA), and capacity (80-110 Ah) for automotive and renewable energy systems. Selecting AGM or flooded types depends on application-specific demands for cycle life, maintenance, and temperature resilience.

FAQ

Is a Group 27 battery a deep-cycle or starting battery?

Some Group 27 batteries are dual-purpose, offering both high CCA for engine starts and deep-cycle durability. Marine/RV models often have 20% thicker plates than standard automotive batteries.

Can I replace a Group 24 with a Group 27 battery?

Yes, if the tray accommodates the larger size (Group 27 is 2.1″ longer). Ensure terminals align and cables reach. The increased Ah provides longer runtime for accessories.

How long does a Group 27 battery last?

4-6 years for AGM, 3-5 years for flooded types. Lifespan depends on discharge depth (keep above 50% DoD) and charging practices. Marine environments may reduce life by 20% due to humidity and vibration.