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Optima Yellow Top Dual Purpose Battery - 8012-254 12V 55Ah - YTS4.2, 2 Years Warranty
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Technical Specification
PRODUCT NUMBER YBX9027EK508EK620EK454EK457
Voltage 1212121212
Capacity (AH) 6050624545
Hold Down B3
Cold Cranking Amps (EN1) 640800680380380
Terminal Type T1
Length 242260242237237
Width 175173175127127
Height 190206190227227
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Q 1. What is the cold cranking amp (CCA) rating of the Optima YTS4.2 Yellow Top battery?

A. The Optima YTS4.2 is rated at 765A CCA (EN standard), making it suitable for high-demand starting applications in commercial vehicles, 4x4s, and specialist equipment.

Q 2. What terminal type and polarity configuration does the YTS4.2 use?

A. The YTS4.2 uses SAE top-post terminals in a Type 1 configuration with standard polarity (Type 1). The hold-down type is B00. Always verify terminal layout against your vehicle's requirements before fitment.

Q 3. Is the Optima YTS4.2 compatible with start-stop systems?

A. Optima's AGM Spiralcell technology supports start-stop functionality. However, compatibility with a specific vehicle's start-stop system should always be verified against the product label and your vehicle's OEM specification.

Q 4. Can the YTS4.2 be mounted in any orientation?

A. Yes. As a sealed AGM battery with no free electrolyte, the YTS4.2 can be installed in non-standard orientations, including on its side, provided terminal connections and hold-down security are maintained correctly.

Q 5. What technology does Optima use in the Yellow Top battery, and why does it matter?

A. Optima uses proprietary Spiralcell technology, winding pure lead plates into a tight spiral cylinder. This increases plate surface area, improves vibration resistance, and enhances both cranking performance and cyclic durability compared to conventional flat-plate AGM designs.

Q 6. Are there any direct cross-reference part numbers for the Optima YTS4.2?

A. No verified cross-reference numbers are listed for this product. To confirm a like-for-like replacement, compare the voltage, capacity, CCA rating, and physical dimensions against your existing battery specification.

Q 7. What warranty is provided with the Optima YTS4.2 Yellow Top battery?

A. The YTS4.2 is supplied with a 2-year manufacturer warranty, covering defects in materials and workmanship under normal operating conditions.

Q 8. How long will delivery take, and what is the returns policy for the Optima YTS4.2?

A. The YTS4.2 is dispatched via standard parcel service. Delivery takes 1–3 working days within UK mainland. A 30-day returns policy applies – please ensure the battery is unused and in its original packaging if returning.

Q 9. What are the physical dimensions and weight of the YTS4.2?

A. The battery measures 254 mm (length) × 175 mm (width) × 200 mm (height including terminals) and weighs 20.3 kg. Confirm these dimensions against your battery tray before ordering.

Q 10. Is the Optima YTS4.2 a genuine dual-purpose battery, or is it primarily a starter unit?

A. The YTS4.2 is a true dual-purpose AGM battery, designed to deliver both reliable engine cranking and sustained cyclic discharge for auxiliary loads such as winches, inverters, and emergency lighting — reducing the need for separate starter and leisure batteries.

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