Answer: A Group 27 battery typically measures 12.4–13 inches in length, 6.8–6.9 inches in width, and 9.3–9.5 inches in height. It weighs 54–70 lbs and delivers 66–115 Ah capacity. Designed for marine, RV, and commercial use, it provides robust power for deep-cycle or dual-purpose applications. Always verify exact specifications with the manufacturer.
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What Are the Standard Dimensions of a Group 27 Battery?
A Group 27 battery generally measures 12.4–13 inches (315–330 mm) in length, 6.8–6.9 inches (173–175 mm) in width, and 9.3–9.5 inches (235–240 mm) in height. These dimensions ensure compatibility with designated battery trays and compartments in vehicles like RVs, boats, and trucks. Variations of ±2 mm may occur between brands.
How Much Does a Group 27 Battery Weigh?
Group 27 batteries weigh between 54–70 lbs (24.5–32 kg), depending on construction. Flooded lead-acid versions are lighter (54–60 lbs), while AGM or lithium-ion models weigh more due to denser materials. Weight impacts portability and vehicle load capacity—critical for marine/RV applications.
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What Is the Capacity and Voltage of a Group 27 Battery?
Most Group 27 batteries are 12V with capacities ranging from 66–115 Ah. Deep-cycle variants prioritize sustained energy delivery (e.g., 180–220 minutes reserve capacity), whereas dual-purpose models balance cranking amps (500–800 CCA) and cyclic endurance. Lithium-ion versions often exceed 200 Ah.
Capacity is directly tied to the battery’s discharge rate and temperature. For instance, a 100 Ah AGM battery may deliver 80 Ah at 25°C (77°F) but only 65 Ah in freezing conditions. Voltage stability is another critical factor—lead-acid batteries maintain 12.6V when fully charged, while lithium models hover around 13.2V. Users should match their energy needs with the battery’s discharge curve to avoid premature failure. For example, trolling motors drawing 30A require at least 200Ah for 6–7 hours of runtime.
| Battery Type | Capacity (Ah) | Peak Voltage |
|---|---|---|
| Flooded Lead-Acid | 66–90 | 12.6V |
| AGM | 85–115 | 12.8V |
| Lithium-Ion | 100–200+ | 13.2V |
Which Vehicles or Equipment Use Group 27 Batteries?
Group 27 batteries power marine vessels (trolling motors, bilge pumps), RVs (appliances, lighting), commercial trucks (auxiliary systems), and solar setups. Their size balances energy density and portability, making them ideal for prolonged off-grid use or high-drain accessories.
In marine applications, these batteries handle the constant energy demands of fishfinders, livewell pumps, and navigation systems. For RVs, they support refrigerators, inverters, and HVAC systems during dry camping. Commercial fleets rely on them for hydraulic lifts and emergency lighting. Solar installations benefit from their deep-cycle endurance, especially when paired with MPPT charge controllers. A typical Class C RV might use two Group 27 batteries in parallel to double capacity without exceeding weight limits.
| Application | Power Requirement | Recommended Type |
|---|---|---|
| Marine Trolling | 30–50A continuous | Dual-Purpose AGM |
| RV House Battery | 100–200Ah daily | Deep-Cycle Lithium |
| Solar Storage | 200–400W panels | AGM/Lithium |
How Does a Group 27 Battery Compare to Group 24 or 31?
Group 24 is smaller (10.3×6.8×8.9 in; 45–50 Ah) and suited for compact vehicles. Group 31 is larger (13×6.8×9.4 in; 95–125 Ah) for heavy-duty applications. Group 27 strikes a middle ground, offering 20% more capacity than Group 24 without the bulk of Group 31.
Can a Group 27 Battery Be Used as a Replacement for Other Sizes?
Only if the battery tray and terminal positions align. Group 27’s height/width often matches Group 24/31, but length differences may cause fit issues. Use manufacturer compatibility charts or consult a technician before swapping.
What Maintenance Does a Group 27 Battery Require?
Flooded lead-acid Group 27 batteries need monthly electrolyte checks and terminal cleaning. AGM/gel variants are maintenance-free but require voltage monitoring. Lithium-ion models demand a compatible charger to avoid damage. Store at 50% charge in cool, dry conditions during inactivity.
“Group 27’s versatility makes it a cornerstone for marine and RV power systems. Modern AGM iterations now support 400+ cycles at 50% depth of discharge—double the lifespan of older models. However, users must prioritize proper ventilation; hydrogen buildup in confined spaces remains a safety hazard even with sealed designs.” — Industry Expert, Power Storage Solutions
Conclusion
Group 27 batteries deliver a strategic balance of size and power for diverse applications. By understanding their dimensions, weight, and compatibility, users can optimize performance in marine, RV, or off-grid scenarios. Always cross-reference manufacturer specs and prioritize maintenance to maximize longevity.
FAQs
- 1. Can I install a Group 27 battery in a car designed for Group 24?
- Possibly, if the tray accommodates its extra length (2–3 inches). Check clearance and terminal alignment. Use a hold-down bracket to secure it.
- 2. How long does a Group 27 battery last?
- 3–6 years for lead-acid, 8–12 years for lithium-ion. Lifespan depends on discharge cycles, maintenance, and temperature exposure.
- 3. Is a Group 27 battery suitable for solar power storage?
- Yes, especially deep-cycle AGM or lithium models. They handle daily 50–80% discharge better than starter batteries.