Group 35 and Group 24F batteries differ in size, terminal placement, and weight. Group 35 measures approximately 9″ x 6.8″ x 8.9″ (LxWxH), while Group 24F is larger at 10.3″ x 6.8″ x 9.4″. Group 24F has top-mounted terminals, whereas Group 35 uses side terminals. The weight difference is notable—Group 24F averages 43-48 lbs, while Group 35 is lighter at 32-38 lbs, affecting compatibility in vehicle battery trays.
What Is a Group Size 24 Battery?
| Feature | Group 35 | Group 24F |
|---|---|---|
| Terminal Type | Side posts | Top posts |
| Ideal Climate | Mild winters | Extreme temperatures |
| Typical Price | $100-$150 | $120-$180 |
What Are the Electrical Differences Between Group 35 and Group 24F Batteries?
Group 24F batteries typically offer higher cold cranking amps (CCA) and reserve capacity (RC). A standard Group 24F provides 650-750 CCA and 120-140 RC minutes, compared to Group 35’s 500-650 CCA and 90-110 RC. This makes Group 24F better suited for larger engines or vehicles with higher electrical demands, such as trucks or cars with advanced start-stop systems.
The higher reserve capacity in Group 24F batteries becomes crucial for powering auxiliary systems during engine-off scenarios. Vehicles with multiple electronic accessories (GPS, entertainment systems, or emergency lighting) benefit from the extended runtime. In contrast, Group 35’s lower electrical output may struggle to maintain voltage stability in modified vehicles with aftermarket sound systems or additional lighting. Temperature plays a significant role too—Group 24F’s robust construction handles -40°F cold snaps better, while Group 35 may experience voltage drops below 10 volts in extreme cold.
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Which Vehicles Require Group 24F Batteries?
Group 24F batteries are commonly used in Honda Accords (2013–2017), Toyota Camrys (2012–2017), and Nissan Altimas (2013–2018). They’re also specified for some trucks and SUVs, like the Ford Escape (2013–2016). Using a smaller Group 35 in these vehicles may compromise performance, especially in cold climates or under heavy electrical loads.
European models like certain BMW 3 Series and Mercedes C-Class vehicles also mandate Group 24F batteries due to their energy-intensive start-stop technology. These systems require instantaneous power restoration during frequent engine cycling, which smaller batteries can’t reliably provide. Commercial vehicles such as delivery vans often use Group 24F configurations to support refrigeration units or hydraulic lifts. Always check your vehicle’s battery specification label—usually found near the driver’s side door jamb or underhood—for exact requirements.
| Vehicle Type | Recommended Battery | Alternative Option |
|---|---|---|
| Compact Sedan | Group 35 | Group 51R |
| Full-size Truck | Group 24F | Group 65 |
| Hybrid Vehicle | Group 24F | Specialty AGM |
When Can a Group 35 Battery Be Safely Substituted for Group 24F?
Substitution is possible only if the vehicle’s battery tray accommodates the smaller size, terminals align, and electrical needs are met. For example, compact cars with minimal power demands may tolerate the swap temporarily. Always verify CCA, RC, and terminal polarity matches. Consult your owner’s manual or a mechanic to avoid damaging the charging system.
What Risks Come with Using a Group 35 Battery in Place of Group 24F?
Risks include insufficient power for engine cranking, reduced battery life from overworking, and potential terminal corrosion due to improper fit. The smaller Group 35 may shift in the tray, causing internal damage or short circuits. Warranty voidance is also likely if the substitution causes electrical system failures.
How to Modify a Vehicle to Fit a Group 35 Battery?
Modifications require a battery tray adapter ($20–$50), terminal converters ($10–$25), and secure mounting straps. Use anti-vibration pads to stabilize the smaller battery. However, modifications may violate safety standards and are not recommended by automakers. Professional installation is advised to ensure proper grounding and avoid voltage drops.
What Do Experts Say About Battery Group Substitutions?
“While physically possible in some cases, downgrading battery groups risks overtaxing the alternator and reducing component lifespan,” says automotive engineer Dr. Rachel Torres. “Always prioritize OEM specifications—deviations should only be temporary fixes. Modern vehicles with sensitive electronics are particularly vulnerable to voltage irregularities from mismatched batteries.”
Conclusion
While a Group 35 battery can fit in some Group 24F applications with modifications, it’s not ideal for long-term use. Prioritize matching CCA, RC, and physical dimensions to ensure reliability. When in doubt, consult your vehicle’s manual or a certified technician to avoid costly electrical repairs.
FAQ
- Will a Group 35 battery charge properly in a Group 24F system?
- Yes, but only if the alternator’s output matches the Group 35’s lower capacity. Mismatches may cause overcharging or undercharging.
- Can I use jumper cables to compensate for a smaller battery?
- No—jumper cables address temporary discharge, not chronic undersizing. Frequent jump-starts strain both the battery and starter motor.
- Are lithium-ion batteries a better alternative?
- Lithium batteries offer higher CCA in smaller sizes but cost 3x more and require specialized charging systems. Not all vehicles support them.