Is the Red Top suitable for deep cycling?

No: it delivers very high CCA peaks but isn't designed for repeated deep discharges. That's what the Yellow Top series is for.

What's the difference between RT S 4.2 and RT R 5.0?

They share Ah and CCA; only terminal layout and case shape change to fit different vehicle bays.

Will it fit my classic or restomod car?

It depends on tray dimensions and terminal polarity; use the comparator or tell us your make and model.

How long does an OPTIMA Red Top last?

Used correctly (no deep discharges) it typically outlasts a conventional lead-acid battery thanks to the SpiralCell build, more resistant to vibration and heat.

OPTIMA RED TOP batteries

OPTIMA Red Top batteries are the pure-cranking AGM SpiralCell variant of the OPTIMA range: no deep-cycle capability, built to deliver the brand's highest cold-cranking amps (CCA) peak. 38-75 Ah, CCA 730-1000 A, across the RT R 3.7, RT S 4.2, RT R 5.0 and RT 34 models.

Ideal for American classic restomods, hot-rods, high-performance European V8s and tuning projects with no heavy auxiliary loads, where the only thing that matters is starting the engine with maximum reliability.

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OPTIMA

Car battery Optima RTC-4.2 12V 50Ah 815A AGM

12V

50Ah

815A

254 × 175 × 200 mm

4,78(59)

€185.15 VAT incl.

TO BUY

OPTIMA

Car battery Optima RTU-4.2 12V 50Ah 815A AGM

12V

50Ah

815A

254 × 175 × 200 mm

4,84(36)

€185.15 VAT incl.

TO BUY

OPTIMA

Car battery Optima RTR-3.7 12V 44Ah 730A AGM

12V

44Ah

730A

237 × 172 × 197 mm

4,77(20)

€191.20 VAT incl.

TO BUY

OPTIMA

Car battery Optima RTS-3.7 12V 44Ah 730A AGM

12V

44Ah

730A

237 × 172 × 197 mm

4,81(30)

€190.15 VAT incl.

TO BUY

OPTIMA

Car battery Optima RTS-4.2 12V 50Ah 815A AGM

12V

50Ah

815A

254 × 175 × 200 mm

4,80(37)

€186.70 VAT incl.

TO BUY

OPTIMA

Car battery Optima RTU-3.7 12V 44Ah 730A AGM

12V

44Ah

730A

237 × 172 × 197 mm

4,81(33)

€186.65 VAT incl.

TO BUY

OPTIMA

Car battery Optima RTR-4.2 12V 50Ah 815A AGM

12V

50Ah

815A

254 × 175 × 200 mm

4,80(28)

€209.20 VAT incl.

TO BUY

OPTIMA

Car battery Optima RTF-4.2 12V 50Ah 815A AGM

12V

50Ah

815A

254 × 185 × 184 mm

4,81(26)

€197.00 VAT incl.

TO BUY

OPTIMA

Car battery Optima RTS-2.1 6V 50Ah 815A AGM

50Ah

815A

254 × 90 × 203 mm

4,82(26)

€162.96 VAT incl.

TO BUY

OPTIMA Red Top: pure cranking, no deep cycle

The Red Top series is the cranking-only variant of OPTIMA's SpiralCell technology: spiral-wound lead plates delivering a far higher CCA peak than a conventional lead-acid battery of the same size, but with no deep-cycle capability.

That's why it's the go-to choice for modified cars whose engine demands a reliable start with high compression and zero margin for error.

What projects the Red Top is built for

American classic restorations and restomods.
Hot-rods and show cars.
High-performance European V8s (BMW M and similar).
Classic American pick-ups with large-displacement engines.

Compatibility and how to choose your OPTIMA Red Top

RT R 3.7 (44 Ah, 730 A) for compacts, RT S 4.2 and RT R 5.0 (50 Ah, 815 A) for European V8s and hot-rods, RT 34 (55 Ah, 875 A) for classic pick-ups. With HiFi audio, a winch or a motorhome use Yellow Top; for boats, the marine Blue Top. Check fitment with our comparator or your number plate.

Frequently asked questions about OPTIMA Red Top

Is the Red Top suitable for deep cycling?: No: it delivers very high CCA peaks but isn't designed for repeated deep discharges. That's what the Yellow Top series is for.
What's the difference between RT S 4.2 and RT R 5.0?: They share Ah and CCA; only terminal layout and case shape change to fit different vehicle bays.
Will it fit my classic or restomod car?: It depends on tray dimensions and terminal polarity; use the comparator or tell us your make and model.
How long does an OPTIMA Red Top last?: Used correctly (no deep discharges) it typically outlasts a conventional lead-acid battery thanks to the SpiralCell build, more resistant to vibration and heat.

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