What group size is an H7 battery?

What Is the Group Size of an H7 Battery?

The H7 battery group size refers to a standardized classification under European norms (EN), measuring approximately 278 mm (L) x 175 mm (W) x 190 mm (H). It is commonly used in vehicles with advanced electrical systems, such as luxury cars and start-stop engines. This designation ensures compatibility with specific battery trays and terminal placements.

What Is a Group Size 24 Battery?

How Does the H7 Battery Compare to Other Group Sizes?

H7 batteries are larger than Group 35 (227 mm L) but smaller than Group 49 (353 mm L). They typically offer higher cold-cranking amps (800–950 CCA) and reserve capacity (120–180 minutes) compared to standard sizes, making them ideal for high-demand applications like premium SUVs and hybrid vehicles.

Group Size	Length (mm)	CCA Range	Typical Applications
H7	278	800–950	Luxury sedans, start-stop vehicles
Group 35	227	650–750	Mid-size trucks, older SUVs
Group 49	353	950–1100	Heavy-duty trucks, RVs

The H7’s intermediate size makes it particularly suited for modern vehicles with space-constrained engine bays that still require substantial power reserves. Unlike smaller Group 35 batteries, the H7 can support multiple high-load accessories simultaneously—from heated seats to advanced driver assistance systems. Its reserve capacity outperforms Group 35 by 25–40%, crucial for hybrid vehicles that frequently switch between combustion and electric modes.

Which Vehicles Require an H7 Battery?

H7 batteries are used in European brands like BMW, Mercedes-Benz, and Audi, as well as select Asian models with start-stop technology. Examples include the BMW 5 Series, Mercedes E-Class, and Volvo XC90. Always verify compatibility via the owner’s manual or a fitment guide.

Why Choose an AGM H7 Battery?

Absorbent Glass Mat (AGM) H7 batteries excel in handling frequent charge cycles and high electrical loads. They resist vibration, have longer lifespans (4–7 years), and support advanced features like regenerative braking. AGM is recommended for vehicles with start-stop systems or luxury electronics.

Battery Type	Cycle Life	Vibration Resistance	Ideal Use Case
AGM H7	600–800 cycles	Excellent	Start-stop systems
Flooded H7	300–500 cycles	Moderate	Standard vehicles

AGM technology uses fiberglass separators to hold electrolytes, eliminating free liquid and reducing internal resistance. This design allows faster recharge rates—up to 5x quicker than flooded batteries—critical for vehicles with regenerative braking systems. AGM H7 batteries also operate effectively in sub-zero temperatures (-30°C) where traditional batteries might fail.

How to Maintain an H7 Battery for Longevity

Keep terminals clean, avoid deep discharges, and use a smart charger for AGM models. Test voltage monthly (12.4–12.7V at rest) and replace if capacity drops below 50%. Extreme temperatures accelerate degradation, so park in shaded areas during summer.

Expert Views

“The H7’s design caters to modern vehicles’ energy demands. Its AGM variant is pivotal for start-stop systems, reducing fuel consumption by 5–8%. However, improper charging can halve its lifespan—always use compatible chargers.” — Automotive Electrical Engineer, European Battery Consortium

Conclusion

The H7 battery group size balances physical dimensions and high-performance output for modern vehicles. Understanding its specs ensures optimal vehicle operation and longevity.

FAQs

Can I Replace an H7 Battery with a Group 35?

No. Group 35 is smaller and lacks the CCA/reserve capacity required for H7-compatible vehicles.

What’s the Average Cost of an H7 AGM Battery?

$200–$400, depending on brand and warranty (e.g., Varta: $280 with 4-year coverage).

How Long Does an H7 Battery Last?

3–5 years for standard flooded, 5–7 years for AGM under moderate use.