Group 24 batteries are a popular choice for marine, RV, automotive, and solar applications due to their versatile size and power capacity. We researched and compared the top models using manufacturer specifications, industry safety standards (BCI, SAE, and UL), and aggregated owner feedback from thousands of reviews. Our evaluation focuses on performance, durability, value, ease of use, and safety to help you choose the best group 24 battery for your needs.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Optima Batteries 8025-160 25 RedTop Starting Battery Best Overall Starting Battery 750 CCA, 50 Ah, AGM spiral-cell design, 12V, Group 24 |
9.0 | 🛒 Check Price |
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VMAXTANKS MR127-100 AGM Deep Cycle Battery Best Deep Cycle for Marine/RV 100 Ah, 20 hr rate, 12V, AGM, Group 24 |
8.7 | 🛒 Check Price |
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Odyssey PC925T Automotive and LTV Battery Best Dual-Purpose 330 CCA, 28 Ah, AGM, 12V, Group 24 (short case) |
8.4 | 🛒 Check Price |
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Interstate Batteries 24DC Deep Cycle Marine Battery Best Budget Deep Cycle 75 Ah, 20 hr rate, 12V, Flooded, Group 24 |
8.1 | 🛒 Check Price |
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ACDelco 24AGM Professional AGM Battery Reliable AGM for Daily Drivers 630 CCA, 70 Ah, AGM, 12V, Group 24 |
7.9 | 🛒 Check Price |
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Weize 12V 100Ah Deep Cycle AGM Battery Best Value High Capacity 100 Ah, 20 hr rate, 12V, AGM, Group 24 |
7.6 | 🛒 Check Price |
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Mighty Max Battery ML24-12 12V 24Ah SLA Battery Compact SLA for Small Applications 24 Ah, 20 hr rate, 12V, SLA, Group 24 (smaller case) |
7.3 | 🛒 Check Price |
1. Optima Batteries 8025-160 25 RedTop Starting Battery: Best Overall Starting Battery
The Optima RedTop 8025-160 is a top performer in our evaluation for starting applications. With 750 cold cranking amps (CCA) and a robust AGM spiral-cell design, it delivers reliable engine starts even in sub-zero temperatures. Owner feedback consistently praises its longevity and ability to handle high-vibration environments like off-road vehicles and boats. Based on spec sheets, it meets or exceeds BCI group 24 dimensions and SAE J537 standards.
However, its capacity is only 50 Ah, making it less suitable for deep-cycle applications like trolling motors or RV house batteries. If you need a battery for sustained power draw rather than starting, consider a dual-purpose or deep-cycle model instead. The RedTop is best for those prioritizing cranking power and durability in harsh conditions.
- Spiral-cell AGM technology provides high vibration resistance and low internal resistance for fast starting power.
- Fully sealed and maintenance-free, can be mounted in any position except inverted.
- 15 times more vibration resistant than traditional flooded batteries according to manufacturer specs.
Pros: Excellent starting power even in cold weather; Long lifespan with proper care
Cons: Higher cost per amp-hour compared to flooded batteries
2. VMAXTANKS MR127-100 AGM Deep Cycle Battery: Best Deep Cycle for Marine/RV
The VMAXTANKS MR127-100 stands out in our deep-cycle evaluation for its true 100 Ah capacity at the 20-hour rate, making it ideal for marine trolling motors, RV house power, and solar storage. Based on manufacturer specs and owner feedback, it delivers consistent voltage under load and recovers well after deep discharges. Its AGM construction allows for safe installation in confined spaces without off-gassing.
On the downside, its weight (approx. 68 lbs) is higher than some competitors, which may be a consideration for portable applications. Additionally, while it can handle starting duties in a pinch, it is not optimized for high-cranking amps. If you primarily need starting power, a dual-purpose battery might serve better. This battery is best for those who need reliable deep cycling in a group 24 footprint.
- High capacity 100Ah deep-cycle AGM battery designed for repeated discharge and recharge.
- Thick lead plates and heavy-duty construction for long cycle life.
- Sealed and maintenance-free with low self-discharge rate.
Pros: Excellent deep-cycle performance for trolling motors and solar; Good value for the capacity
Cons: Heavier than some comparable AGM batteries
3. Odyssey PC925T Automotive and LTV Battery: Best Dual-Purpose
The Odyssey PC925T is a high-performance dual-purpose battery that excels in both starting and deep-cycle roles. In our evaluation, its pure lead-tin AGM technology provides low internal resistance and fast charging, which is appreciated by owners using it in motorcycles, ATVs, and small boats. It meets BCI group 24 dimensions but has a shorter height, which can be an advantage in tight compartments.
However, its CCA rating of 330 is lower than many dedicated starting batteries, so it may struggle in very cold climates or with large engines. Also, its 28 Ah capacity limits runtime for deep-cycle applications. If you need a battery for a high-CRA starting application or long-duration power, consider a larger model. The PC925T is best for those wanting a lightweight, high-cycle battery for mixed use.
- Pure lead-tin plates for superior power density and faster recharge.
- Can deliver 400 cycles at 80% depth of discharge per manufacturer data.
- Extremely vibration resistant and spill-proof.
Pros: Excellent cycle life and recharge speed; Compact size fits many group 24 trays
Cons: Lower CCA than typical starting batteries; Premium price for the capacity
4. Interstate Batteries 24DC Deep Cycle Marine Battery: Best Budget Deep Cycle
The Interstate 24DC is a budget-friendly flooded deep-cycle battery that offers solid 75 Ah capacity for marine and RV use. Based on owner feedback and spec sheets, it provides reliable power for trolling motors and house loads at a lower upfront cost compared to AGM. Its reserve capacity is strong for its class, and it meets BCI group 24 dimensions.
However, as a flooded battery, it requires periodic water refills and must be installed in a ventilated area to avoid gas buildup. Its cycle life is shorter than AGM counterparts, typically lasting 2-4 years with regular use. If you are looking for a low-cost solution for occasional use and don’t mind maintenance, this is a good pick. For frequent deep cycling or vibration-heavy environments, an AGM option may be worth the extra investment.
- Traditional flooded deep-cycle design with high reserve capacity.
- Durable polypropylene case with reinforced corners.
- Maintenance-free but requires periodic water level checks.
Pros: Very affordable for the capacity; Widely available at auto parts stores
Cons: Shorter lifespan than AGM alternatives; Requires ventilation and occasional maintenance
5. ACDelco 24AGM Professional AGM Battery: Reliable AGM for Daily Drivers
The ACDelco 24AGM is a solid all-rounder for daily drivers and light marine use. With 630 CCA and 70 Ah, it can handle starting and moderate accessory loads. In our evaluation, it meets OEM specifications for many vehicles and is backed by ACDelco’s reputation. Owner feedback is generally positive, citing reliable starts and easy installation.
However, some owners report inconsistent lifespan, with a few batteries failing within a year. While this is not universal, it suggests quality control variations. Additionally, its deep-cycle capability is limited compared to purpose-built deep-cycle batteries. If you need a battery for frequent deep discharges, consider a true deep-cycle model. This battery is best for standard automotive or occasional marine starting needs.
- AGM technology with absorbed glass mat separators for leak-proof operation.
- High CCA for reliable starting in most climates.
- Calcium lead grid for improved corrosion resistance.
Pros: Good balance of starting power and reserve capacity; Maintenance-free and spill-proof
Cons: Some owner reports of premature failure; Not as robust in deep-cycle as dedicated models
6. Weize 12V 100Ah Deep Cycle AGM Battery: Best Value High Capacity
The Weize 100Ah AGM battery offers impressive capacity for the price, making it a popular choice for budget-conscious buyers in solar and marine applications. Based on owner feedback, it performs adequately for moderate deep-cycle use and holds voltage well. Its AGM construction allows for safe installation in various orientations.
However, our evaluation of spec sheets and reviews indicates that its cycle life is likely lower than premium brands like VMAX or Odyssey, especially under deep discharge. Some users report capacity degradation after a year of heavy use. If you need a battery for frequent deep cycling or critical applications, investing in a higher-quality brand may be wise. The Weize is best for backup power or light-duty deep-cycle use where budget is a primary concern.
- High capacity 100Ah AGM at a competitive price point.
- Sealed and maintenance-free design with low self-discharge.
- Suitable for solar, UPS, and trolling motor applications.
Pros: Very affordable for 100 Ah AGM; Good customer service from seller
Cons: Lower build quality than premium brands; Cycle life may be shorter in heavy use
7. Mighty Max Battery ML24-12 12V 24Ah SLA Battery: Compact SLA for Small Applications
The Mighty Max ML24-12 is a small SLA battery that fits the group 24 footprint but with much lower capacity (24 Ah). It is designed for standby power in alarms, gate openers, and small electronics. Owner feedback indicates it works reliably for these light-duty applications and is easy to install.
However, it has very low CCA (not rated for starting) and cannot deliver the high current needed for engine cranking or trolling motors. Its cycle life is also limited if deeply discharged. This battery is not a direct replacement for automotive or marine group 24 batteries. If you need a battery for a vehicle or boat, skip this one. It is best for low-power backup systems where size and price are the main considerations.
- Sealed lead-acid (SLA) battery, often used in alarm systems and backup lights.
- Low self-discharge rate and maintenance-free.
- Compact size fits where group 24 dimensions are not critical.
Pros: Very low cost; Works well for light-duty backup power
Cons: Not suitable for starting engines or high-current loads; Low capacity limits applications
Frequently Asked Questions
What is a group 24 battery?
Group 24 is a standard battery size defined by the Battery Council International (BCI). It typically measures approximately 10.25 x 6.8 x 8.9 inches (L x W x H) and is used in many automotive, marine, RV, and solar applications. Group 24 batteries come in various chemistries including flooded, AGM, and gel.
What is the difference between starting, deep-cycle, and dual-purpose batteries?
Starting batteries deliver high current for short bursts to start an engine, with thin plates for maximum surface area. Deep-cycle batteries have thicker plates and can be discharged repeatedly to a lower state of charge without damage, making them ideal for trolling motors or house loads. Dual-purpose batteries offer a compromise, with moderate starting power and decent deep-cycle capability.
How do I choose between flooded and AGM group 24 batteries?
Flooded batteries are cheaper but require maintenance (water refills) and must be installed upright in a ventilated area. AGM batteries are sealed, maintenance-free, vibration-resistant, and can be mounted in various orientations, but they cost more. For marine or off-road use, AGM is often preferred for safety and durability.
Can I use a group 24 battery for my RV house battery?
Yes, group 24 deep-cycle or dual-purpose batteries are common for RV house power. However, consider your power needs: a single 100 Ah group 24 battery may be sufficient for lights and small appliances, but larger RVs often require multiple batteries or larger group sizes (e.g., group 27 or 31).
How long do group 24 batteries typically last?
Lifespan varies by type and usage. Flooded deep-cycle batteries last 2-5 years with proper maintenance. AGM batteries can last 3-7 years, depending on depth of discharge and charging practices. Starting batteries used for deep cycling may fail prematurely. Regular charging and avoiding deep discharges extend life.
Our Verdict
After researching and comparing the top group 24 batteries, the Optima RedTop 8025-160 earns our top pick for starting applications due to its exceptional CCA, vibration resistance, and reliability. For deep-cycle needs, the VMAXTANKS MR127-100 is our runner-up, offering true 100 Ah capacity and robust construction for marine and RV use. Choose based on your primary use case: starting, deep cycling, or a balance of both.
