AA LiFePO₄ M42 is a compact lithium iron phosphate automotive battery designed as a modern replacement for conventional M42 lead-acid batteries used in small Japanese and local vehicles with Start-Stop (ISS) systems. It delivers stable voltage, faster cranking, and longer service life compared to traditional batteries.

Size & Compatibility

Battery Size: JIS M42
Physical Size (Approx.): 196 × 128 × 200 mm

Replaces Lead-Acid Sizes:

• JIS: M42

• DIN / EN: DIN45, DIN50

• Common Codes: NS40ZL, 44B19, 46B19

Typical Vehicles:
Perodua Myvi
Perodua Bezza
Perodua Axia
Toyota Vios
Honda City

Warranty

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

Comparison – LiFePO₄ vs Lead-Acid Battery

✅ Advantages over Lead-Acid

• Significantly lighter weight

• Faster and stronger engine cranking

• No acid leakage or corrosion

• No sulfation during storage

• Longer service life

• Stable voltage for Start-Stop systems

⚠ Considerations

• Higher upfront cost compared to lead-acid

• Battery size must match original fitment

Why Choose AA LiFePO₄ M42

• Safe and stable LiFePO₄ chemistry

• Designed for automotive Start-Stop applications

• Maintenance-free operation

• Reduced long-term replacement cost

• Backed by extended warranty coverage

Q&A (SEO-Friendly)

Q: Can AA LiFePO₄ M42 replace my original M42 battery?
Yes. It is designed as a direct physical replacement for M42 size lead-acid batteries, provided the battery tray and terminal layout match.

Q: Is LiFePO₄ safe for daily driving?
Yes. LiFePO₄ is one of the safest lithium battery chemistries and is widely used in automotive and energy storage applications.

Q: Can I replace M42 with Q85?
No. M42 and Q85 are different physical sizes and are not interchangeable.

Q: Is this suitable for Start-Stop vehicles?
Yes. AA LiFePO₄ M42 is designed to support vehicles equipped with Start-Stop (ISS) systems.

Important Note

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