12,256 customer reviewsThank you for trusting us!Thank you! Excellent 4.5 out of 5

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.

There are 9 products.

Sort by:

On sale!

OPTIMA

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

12V

50Ah

815A

254 × 175 × 200 mm

5,00(3)

€185.80 VAT incl.

Buy

OPTIMA

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

12V

50Ah

815A

254 × 175 × 200 mm

€187.40 VAT incl.

Buy

OPTIMA

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

50Ah

815A

254 × 90 × 203 mm

5,00(4)

€163.60 VAT incl.

Buy

OPTIMA

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

12V

50Ah

815A

254 × 175 × 200 mm

5,00(1)

€185.80 VAT incl.

Buy

OPTIMA

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

12V

44Ah

730A

237 × 172 × 197 mm

€187.30 VAT incl.

Buy

OPTIMA

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

12V

44Ah

730A

237 × 172 × 197 mm

€191.90 VAT incl.

Buy

OPTIMA

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

12V

50Ah

815A

254 × 175 × 200 mm

€209.90 VAT incl.

Buy

OPTIMA

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

12V

50Ah

815A

254 × 185 × 184 mm

5,00(1)

€204.95 VAT incl.

Buy

OPTIMA

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

12V

44Ah

730A

237 × 172 × 197 mm

€190.80 VAT incl.

Buy

Showing 1-9 of 9 item(s)

Frequently asked questions

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: 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.

Catalogue curated by our technical team. 12,256 Trustpilot reviews · 4.5/5. 24-48 h delivery in mainland Spain and Portugal (orders before 6:00 pm); 14-day returns with free collection on the Iberian mainland.

Cookie	Provider	Purpose	Expiry
PHP_SESSID	baterias.com	The PHPSESSID cookie is native to PHP and allows websites to store serialised status data. On the website it is used to establish a user session and to pass state data through a temporary cookie, which is commonly known as a session cookie. These Cookies will only remain on your computer until you close your browser.	Session
PrestaShop-#	baterias.com	This is a cookie used by Prestashop to store information and keep the user's session open. It stores information such as currency, language, customer ID, among other data necessary for the proper functioning of the shop.	480 hours

Cookie	Provider	Purpose	Expiry
ANONCHK	Microsoft (Clarity)	Auxiliary Microsoft cookies used to synchronise the identifier across its domains.	10 minutes
CLID	Microsoft (Clarity)	Identify the browser’s first visit to the website in Clarity.	1 year
MR	Microsoft (Clarity)	Auxiliary Microsoft cookies used to synchronise the identifier across its domains.	7 days
MUID	Microsoft (Clarity)	Identify unique browsers across Microsoft services.	1 year
SM	Microsoft (Clarity)	Auxiliary Microsoft cookies used to synchronise the identifier across its domains.	Session
_clck	Microsoft (Clarity)	Store Clarity’s pseudonymous identifier to recognise visits from the same browser.	1 year
_clsk	Microsoft (Clarity)	Group the pages viewed into the same Clarity session.	1 day

OPTIMA RED TOP batteries

Frequently asked questions

OPTIMA Red Top: pure cranking, no deep cycle

What projects the Red Top is built for

Compatibility and how to choose your OPTIMA Red Top

Best sellers in OPTIMA RED TOP batteries