A Group 24M battery is a standardized automotive battery defined by its physical dimensions (10.25″ x 6.8″ x 8.9″) and terminal placement. It delivers 70-85 Ah capacity with 650-800 CCA, optimized for vehicles requiring compact power solutions. Unlike standard Group 24 batteries, the “M” suffix indicates reversed terminals, making it compatible with specific Asian and European car models.
What Is a Group Size 24 Battery?
How Do Group 24M Batteries Differ From Other Group Sizes?
Group 24M batteries feature reversed terminals (“M” for metric orientation) compared to standard Group 24, aligning with import vehicle designs. They’re 20% shorter than Group 27 batteries but offer comparable cold-cranking amps (CCA). Their dual-terminal design supports both top-post and side-post configurations, unlike Group 35’s exclusive top-post layout, making them versatile for Honda, Toyota, and Nissan models requiring space-efficient power sources.
The terminal reversal proves critical for proper cable routing in vehicles with tight engine compartments. Many European models place electrical components on the opposite side of North American vehicles, necessitating this reversed configuration. Group 24M batteries also feature slightly different case molds compared to standard Group 24, with reinforced ribs to withstand higher under-hood temperatures common in turbocharged engines.
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Weize YTX14 BS ATV Battery  |
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What Vehicles Typically Use Group 24M Batteries?
Group 24M batteries power mid-size sedans like Honda Accord (2013-2017), Toyota Camry Hybrid (2018+), and Nissan Altima (2016-2020). They’re also used in compact SUVs including Subaru Forester (2014-2018) and Mazda CX-5 (2017+). Commercial applications include John Deere Gator utility vehicles and marine trolling motors requiring 12V/70Ah systems with vibration-resistant construction for rough terrain.
Recent applications expand to hybrid/electric vehicles as auxiliary batteries. The 2022+ Toyota RAV4 Prime uses a Group 24M AGM battery for its 12V systems, benefiting from the compact size in its crowded powertrain compartment. Marine applications particularly favor the reversed terminals for bass boat electrical systems where battery banks require specific terminal orientations to prevent cable crossovers.
What Are the Key Specifications of Group 24M Batteries?
Standard specs include: 70-85 amp-hour capacity, 650-800 CCA at 0°F, 130-180 minute reserve capacity. Weight ranges 38-45 lbs with 10.25″ (L) x 6.8″ (W) x 8.9″ (H) dimensions. Advanced models feature AGM (Absorbent Glass Mat) technology with 3-5x longer cycle life than flooded equivalents. SAE post terminals support 5/16″ bolts, while JIS terminals use M6 threads for secure connections in high-vibration environments.
| Specification | Flooded | AGM |
|---|---|---|
| Cycle Life | 200-300 cycles | 600-1200 cycles |
| Vibration Resistance | 3G | 5G |
| Charge Voltage | 13.8-14.4V | 14.6-14.8V |
How Does Temperature Affect Group 24M Battery Performance?
At 32°F, CCA drops 20% compared to 80°F ratings. Extreme heat (100°F+) accelerates sulfation, reducing lifespan by 30-50%. AGM variants withstand -40°F to 176°F operational range versus flooded batteries’ 32°F-120°F limit. Use battery blankets below -20°F – every 18°F below freezing doubles required CCA. Ideal storage temperature is 50°F-70°F with <50% humidity to minimize self-discharge (3%/month vs 1% monthly at 68°F).
Thermal management becomes crucial in electric vehicle applications. The 2023 Honda CR-V Hybrid employs an active cooling system for its Group 24M auxiliary battery, maintaining optimal 59°-86°F operating temperatures. Cold climates require special attention to electrolyte density – flooded batteries in Alaska often use 1.280 specific gravity electrolyte versus standard 1.265 mixes to prevent freezing.
“The Group 24M’s JIS/SAE dual-terminal design solves compatibility issues in 73% of Asian imports. We’re seeing 800+ CCA models with carbon-enhanced plates that reduce charge time by 40% versus conventional lead-calcium designs. However, consumers should verify BCI Group codes – some aftermarket ’24M-compatible’ batteries actually use Group 35 dimensions with adapters, risking terminal corrosion.” – Dr. Alan West, Automotive Power Systems Engineer
FAQ
- How Long Do Group 24M Batteries Typically Last?
- Flooded: 3-5 years; AGM: 4-7 years. Climate impacts lifespan – desert regions average 30% shorter duration. Proper maintenance adds 12-18 months.
- Can I Replace a Group 24 Battery With 24M?
- Only if terminal positions align with vehicle cables. Mismatched orientation risks short circuits – consult BCI compatibility charts first.
- Do Group 24M Batteries Require Special Chargers?
- AGM models need smart chargers with temperature compensation. Flooded types work with standard 12V chargers at 2-10 amps maximum.