What Group Size Is an H7 Battery? Key Specifications and Equivalents
The H7 battery is part of the European Battery Council International (BCI) sizing system, equivalent to Group 94R in the U.S. standard. It measures 12.4 x 6.9 x 7.5 inches (LxWxH) and features top terminals with the positive post on the right. Commonly used in vehicles with start-stop technology, it supports AGM or EFB battery types.
How to Choose a Motorcraft Tested Tough Max Battery Replacement
How Does the H7 Battery Compare to Other Group Sizes?
The H7 battery is larger than the H6 (Group 48) but smaller than the H8 (Group 49). Unlike Group 65 (common in trucks), the H7 is optimized for European cars like BMW, Audi, and Mercedes. Its 94R equivalence ensures compatibility with modern vehicles requiring higher reserve capacity (typically 80-100 Ah) and cold-cranking amps (700-900 CCA).
| Group Size | Dimensions (LxWxH) | Typical CCA | Common Vehicles |
|---|---|---|---|
| H6 (48) | 12.0 x 6.9 x 7.5″ | 600-800 | VW Golf, Audi A3 |
| H7 (94R) | 12.4 x 6.9 x 7.5″ | 700-900 | BMW 5 Series, Mercedes E-Class |
| H8 (49) | 13.0 x 6.9 x 7.5″ | 800-1000 | Porsche Cayenne, Audi Q7 |
The H7 strikes a balance between compact design and power delivery. While Group 65 batteries share similar CCA ratings, their wider casing (7.5″ vs 6.9″) makes them incompatible with European battery trays. The H7’s standardized terminal placement also prevents accidental reverse connections common when using non-compliant replacements.
Top 5 best-selling Group 14 batteries under $100
| Product Name | Short Description | Amazon URL |
|---|---|---|
|
Weize YTX14 BS ATV Battery  |
Maintenance-free sealed AGM battery, compatible with various motorcycles and powersports vehicles. | View on Amazon |
|
UPLUS ATV Battery YTX14AH-BS  |
Sealed AGM battery designed for ATVs, UTVs, and motorcycles, offering reliable performance. | View on Amazon |
|
Weize YTX20L-BS High Performance  |
High-performance sealed AGM battery suitable for motorcycles and snowmobiles. | View on Amazon |
|
Mighty Max Battery ML-U1-CCAHR  |
Rechargeable SLA AGM battery with 320 CCA, ideal for various powersport applications. | View on Amazon |
|
Battanux 12N9-BS Motorcycle Battery  |
Sealed SLA/AGM battery for ATVs and motorcycles, maintenance-free with advanced technology. | View on Amazon |
Which Vehicles Use the H7 Battery?
H7 batteries are standard in European models like BMW 3/5 Series, Mercedes C/E-Class, and Audi A4/A6. Asian brands like Hyundai Sonata Hybrid and Kia Sorento also use them for start-stop systems. Always verify your vehicle’s manual or existing battery label to confirm compatibility.
Why Do Start-Stop Systems Require H7 Batteries?
Start-stop technology demands frequent engine restarts, which strain traditional batteries. H7 AGM or EFB batteries handle deep cycling and rapid charging better. AGM variants offer longer lifespan (4-6 years) and vibration resistance, making them ideal for energy-intensive systems like regenerative braking.
| Battery Type | Cycle Life | Charge Acceptance | Ideal Use Case |
|---|---|---|---|
| AGM | 1,200 cycles | 3x faster than EFB | Premium vehicles with energy recovery |
| EFB | 800 cycles | 2x faster than flooded | Entry-level start-stop systems |
Modern vehicles with start-stop systems may activate the engine 50+ times per urban commute. AGM batteries tolerate this workload through absorbed glass mat separators that prevent acid stratification. Their recombinant chemistry also reduces gassing, allowing installation in sealed compartments like trunk-mounted battery wells.
What Are the Key Specifications of an H7 Battery?
Typical H7 specs include 12V voltage, 80-100 Ah capacity, 700-900 CCA, and 160-180 minute reserve capacity. AGM versions weigh 50-60 lbs, while EFB is lighter (45-55 lbs). Terminal placement (positive on right) ensures proper fitment in designated trays, preventing electrical shorts.
Can You Replace an H7 Battery with a Different Group Size?
Swapping H7 with non-compliant sizes risks poor fitment, terminal damage, or system errors. Use only BCI 94R or DIN H7 batteries. After replacement, some vehicles require ECU reprogramming to recognize the new battery, especially for AGM systems. Consult a mechanic to avoid voltage mismatches.
How to Maintain an H7 Battery for Longevity?
Keep terminals clean and corrosion-free using baking soda and water. For AGM batteries, avoid overcharging (above 14.8V). Test voltage monthly; 12.6V indicates full charge. If unused, use a maintainer to prevent discharge below 12.4V. Replace every 4-6 years or if CCA drops by 30%.
Expert Views
“H7 AGM batteries are the backbone of modern automotive electrical systems. Their ability to handle high cyclic loads makes them indispensable for hybrids and start-stop vehicles. Always prioritize OEM-spec replacements to avoid damaging sensitive electronics.” — Automotive Engineer, PowerTech Batteries
Conclusion
The H7 battery (Group 94R) is a critical component for European and hybrid vehicles, offering robust performance for start-stop systems. Understanding its specs, compatibility, and maintenance ensures optimal vehicle operation and longevity.
FAQ
- Is H7 the same as 94R?
- Yes, H7 is the European designation for BCI Group 94R.
- Can I use an H6 instead of H7?
- No—H6 is smaller and may lack required CCA.
- Are H7 batteries only AGM?
- No, but AGM is recommended for start-stop systems.