What Are Specs Of A 24F AGM Battery?
A 24F AGM battery is a Group 24F lead-acid battery using Absorbent Glass Mat (AGM) technology, delivering 12V nominal voltage with capacities ranging from 70–85 Ah. Key specs include dimensions of ~10.3″ x 6.8″ x 8.9″, cold cranking amps (CCA) of 650–800A, and maintenance-free operation. Designed for vehicles requiring high starting power and vibration resistance, it’s ideal for trucks, marine applications, and UPS systems. AGM construction prevents acid leakage, supports deep cycling, and offers a 3–5-year lifespan with proper charging (14.4–14.8V absorption).
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What are the physical dimensions of a 24F AGM battery?
A Group 24F AGM battery typically measures 10.3″ (L) x 6.8″ (W) x 8.9″ (H), with terminal positions reversed compared to Group 24. Its compact design suits engine bays with limited space, like Toyota Tacomas or Honda Accords. Pro Tip: Always verify terminal orientation—installing reversed terminals can fry vehicle electronics.
Beyond size, weight matters—24F AGM batteries weigh 45–55 lbs due to dense lead plates. For example, a 24F 75Ah AGM battery in a Ford F-150 provides secure fitment with tray clamps. Transitionally, while dimensions are standardized, post types (top/post vs. side terminals) vary. Always measure your existing tray and check clearance for cables. But what if you force-fit a mismatched size? Pressure on terminals risks cracks and acid vapor leaks. A marine-grade 24F AGM, like those used in bass boats, often adds reinforced casing for shock resistance.
| Group Size | Length (in) | Width (in) | Height (in) |
|---|---|---|---|
| 24F | 10.3 | 6.8 | 8.9 |
| 34 | 10.2 | 6.8 | 7.9 |
| 27 | 12.2 | 6.8 | 8.9 |
How does CCA affect 24F AGM battery performance?
Cold Cranking Amps (CCA) measures a 24F AGM battery’s ability to start engines in cold temperatures. Ratings of 650–800A ensure reliable ignition at 0°F (-18°C). Higher CCA is critical for diesel trucks or Arctic applications.
Practically speaking, CCA depends on plate surface area and electrolyte efficiency. AGM batteries outperform flooded types here—their tightly packed mats reduce internal resistance. For instance, a 24F AGM with 800 CCA can crank a frozen 6.7L PowerStroke diesel 3x longer than a 600 CCA unit. Transitionally, though, higher CCA often means thicker plates, which slightly reduce deep-cycle capacity. Pro Tip: Don’t prioritize CCA alone—balance it with RC (Reserve Capacity) if running accessories during engine-off periods. Ever wonder why some AGMs sag in summer? Heat increases self-discharge, so opt for models with thermal-stable separators.
What is the lifespan of a 24F AGM battery?
24F AGM batteries last 3–5 years, depending on cycling depth and charging habits. Regular partial discharges (≤50%) and proper float voltage (13.2–13.8V) maximize longevity.
Deep cycling tolerance sets AGM apart—a 24F can handle 400+ cycles at 50% DoD versus 200 for flooded equivalents. For example, RV owners using 24F AGMs for solar storage report 4-year lifespans with monthly equalization charges. Transitionally, sulfation is less problematic in AGMs, but over-discharging below 10.5V permanently damages cells. A marina using 24F batteries for dock lighting pairs them with smart chargers to prevent voltage drops. But how do temperature extremes affect lifespan? Heat accelerates corrosion by 2x per 15°F above 77°F—install heat shields in engine compartments.
| Battery Type | Cycle Life (50% DoD) | Typical Lifespan |
|---|---|---|
| 24F AGM | 400 | 3–5 years |
| Flooded 24F | 200 | 2–4 years |
| LiFePO4 24F | 3000 | 8–10 years |
How to charge a 24F AGM battery correctly?
Use a smart AGM-compatible charger delivering 14.4–14.8V during absorption and 13.2–13.8V float. Avoid over 15V—AGM’s low impedance risks thermal runaway if overcharged.
Charging stages matter: Bulk (80% SoC) at 10–30A, Absorption (14.4V until current drops to 0.5A), then Float. For example, NOCO Genius5 maintains 24F AGMs optimally. Transitionally, solar users should set charge controllers to AGM mode—PWM types risk undercharging. Pro Tip: Equalize AGMs only if specified—some allow 15.5V pulses 2x/year to balance cells. What if you use a flooded battery charger? It’ll undercharge by 0.8V, causing sulfation. Marine dual-bank systems require independent AGM profiles per battery.
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FAQs
Yes, but reprogram your charger/alternator—AGMs need higher voltage (14.4–14.8V vs. 13.8–14.2V for flooded). Mismatched charging reduces capacity 30% in 6 months.
Are 24F AGM batteries safe for indoor use?
Yes—AGM’s sealed design prevents gas emission, unlike flooded. Ideal for UPS systems in server rooms. Still, avoid charging in confined spaces without ventilation.
Why does my 24F AGM show 12.8V but won’t start the engine?
Surface charge deception—load test it. A healthy 24F AGM holds ≥9.6V under 50% CCA load for 15 seconds. Voltage without current capacity indicates failed cells.