AA LiFePO₄ Q85 is a high-capacity lithium iron phosphate automotive battery designed as a modern replacement for conventional Q85 EFB / AGM lead-acid batteries. It is commonly used in larger Japanese vehicles and Start-Stop systems that require higher cranking performance and stable voltage.

Size & Compatibility

Battery Size: JIS Q85
Physical Size (Approx.): 232 × 173 × 225 mm

Replaces Lead-Acid Sizes:

• JIS: Q85

• DIN / EN: DIN65, DIN70

• Common Codes: 55D23, 60D23

Typical Vehicles:
Mazda i-Stop models
Honda Civic
Honda HR-V
Toyota Corolla Cross
Other mid-to-large Start-Stop vehicles using Q85 size

Warranty

3 Years or 60,000 km (whichever comes first)

Comparison – LiFePO₄ vs Lead-Acid Battery

✅ Advantages over Lead-Acid (EFB / AGM)

• Significantly lighter weight

• Faster and stronger engine cranking

• Stable voltage output for Start-Stop systems

• No acid leakage or corrosion

• No sulfation during storage

• Longer service life under daily use

⚠ Considerations

• Higher upfront cost compared to lead-acid batteries

• Battery tray size and terminal layout must match Q85 specifications

Why Choose AA LiFePO₄ Q85

• Safe and stable LiFePO₄ chemistry

• Designed for higher-capacity Start-Stop applications

• Maintenance-free operation

• Reduced long-term replacement frequency

• Backed by extended warranty coverage

Q&A (SEO-Friendly)

Q: Can AA LiFePO₄ Q85 replace my original Q85 EFB or AGM battery?
Yes. It is designed as a direct physical replacement for Q85 size batteries, provided the battery tray and terminal layout match.

Q: Is Q85 larger than M42?
Yes. Q85 is physically larger and offers higher capacity. M42 and Q85 are not interchangeable.

Q: Is LiFePO₄ suitable for Start-Stop vehicles?
Yes. LiFePO₄ provides stable voltage and fast recovery, making it suitable for Start-Stop systems.

Q: Does this require special maintenance?
No. AA LiFePO₄ Q85 is maintenance-free and does not require topping up or periodic charging under normal use.

Important Note

Battery size refers to physical dimensions and terminal layout. Please confirm your original battery size before ordering.