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Optima Red Top Starter Battery - 8004-250 12V 50Ah - RTU4.2, 2 Years Warranty
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Technical Specification
PRODUCT NUMBER YBX9027EK508EK454EK457LF027
Voltage 1212121212
Capacity (AH) 6050454560
Hold Down B3
Cold Cranking Amps (EN1) 640800380380680
Terminal Type T11
Length 242260237237242
Width 175173127127175
Height 190206227227190
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Q 1. What is the cold cranking amp rating of the Optima Red Top 8004-250?

A. The Optima Red Top 8004-250 is rated at 815 Cold Cranking Amps (CCA) to EN standard, making it suitable for high-compression and performance engines that demand sustained high-output cranking power.

Q 2. What is the capacity and voltage of the Optima Red Top RTU4.2?

A. The battery operates at 12 volts with a rated capacity of 50Ah at the C20 discharge rate.

Q 3. What are the physical dimensions of the Optima 8004-250 battery?

A. The battery measures 254mm in length, 175mm in width, and 200mm in height including the terminal. It weighs 15.7kg.

Q 4. What terminal arrangement does the Optima Red Top 8004-250 use?

A. This battery uses a combination terminal arrangement with a top-mounted positive terminal and a side-mounted negative terminal, classified as terminal type 1 + SIDE. Polarity is type 1 (positive on the right when viewed from the front).

Q 5. What hold-down type is required for the Optima Red Top RTU4.2?

A. The Optima Red Top 8004-250 requires a B00 hold-down configuration. Confirm that your vehicle's battery tray and retaining hardware are compatible before fitting.

Q 6. Is the Optima Red Top 8004-250 compatible with start-stop systems?

A. Optima's AGM technology is capable of supporting start-stop applications; however, compatibility is not guaranteed for all vehicles. You must verify suitability against the product label and your vehicle manufacturer's specification before fitment.

Q 7. What technology does the Optima Red Top use, and is it maintenance-free?

A. The 8004-250 uses Optima's SpiralCell absorbed glass mat (AGM) construction. The electrolyte is immobilised within glass mat separators, producing a fully sealed, maintenance-free battery that requires no topping up.

Q 8. What vehicles or applications is the Optima Red Top 8004-250 suited to?

A. The battery is designed for starter applications in tuned vehicles, modified street cars, high-performance applications, and generator starting duties where a compact footprint and high cranking output are required.

Q 9. What warranty is provided with the Optima Red Top RTU4.2?

A. The Optima Red Top 8004-250 is supplied with a 2-year manufacturer's warranty covering defects in materials and workmanship from the date of purchase.

Q 10. How long will delivery take for the Optima Red Top 8004-250?

A. Orders are dispatched via standard parcel service and delivered within 1–3 working days to UK mainland addresses. A 30-day returns policy applies.

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