Yuasa Q-85 / 95D23L EFB (12V 66Ah 590A)

The Gold Standard for Mazda SkyActiv & Toyota ISS. Made in Japan.

The “Q-85” is the specific Japanese Industrial Standard (JIS) code for this battery size and performance tier. The Yuasa version is often the factory-installed (OE) battery because of its superior durability and fast-charging capabilities.

✨ Key 2026 Technical Features

• 🔄 2x Cycle Life:

  Engineered to provide up to 2 times the cycle life of a conventional lead-acid battery. This is critical for ISS vehicles where the battery may experience hundreds of discharge/charge cycles in a single week of Singapore city driving.

• ⚡ High Charge Acceptance:

  Features specialized carbon additives on the negative plates. This allows the battery to recharge up to 50% faster than standard batteries, ensuring it is ready for the next engine restart after a short cruise between traffic lights.

• 🏗️ Thicker Lead Plates:

  The internal lead plates are thicker and utilize high-density active material. This reinforcement provides superior vibration resistance and prevents the structural degradation caused by frequent high-current cranking.

• 🌡️ Tropical Climate Optimization:

  While many batteries struggle with Singapore’s heat, the Yuasa JP-spec is designed with a high heat tolerance. This helps prevent electrolyte evaporation and extends the service life to a typical 18–24 months for ISS cars.

• 🛑 Start-Stop Compatibility:

  Specifically calibrated for the Mazda i-Stop system. Using a non-EFB battery in these cars often results in the system disabling itself or the battery failing prematurely within 6 months.

📊 Performance Summary

• ISS Reliability: ⭐⭐⭐⭐⭐ (The factory-recommended benchmark)

• Starting Power: ⭐⭐⭐⭐⭐ (Robust 590A for instant starts)

• Charging Speed: ⭐⭐⭐⭐⭐ (Carbon-plus tech for rapid recovery)

• Durability: ⭐⭐⭐⭐⭐ (Premium Japanese manufacturing)

The Yuasa Q-85 EFB (JP) is the essential choice for 2026 if you drive a Mazda 3, 6, CX-5, or a Toyota Harrier with start-stop technology. It is the only battery that ensures your vehicle’s fuel-saving features and electrical systems operate exactly as the manufacturer intended.