# OPTIMA batteries > Optima AGM SpiralCell: Red Top pure starting, Yellow Top dual deep cycle, Blue Top marine. 4x4, audio, hot rod, off-road. Dispatched within 24h. 14-day returns. **Category:** [Start](https://baterias.com/gb/) → [Battery brands](https://baterias.com/gb/battery-brands) - **Canonical URL**: https://baterias.com/gb/batteries-optima - **Language**: en-GB ## Description Official **Optima battery** dealer, AGM SpiralCell: Red Top for starting, Yellow Top for dual purpose and Blue Top for marine, 38 to 75 Ah and up to 975 A cranking, with live prices and 24-48 h shipping. The choice for 4x4s with winches, competition audio, classics, off-road and boats with service loads: vibration-proof, deep-cycle capable and mountable in any position. ## Optima SpiralCell: what makes it different Optima Batteries (Clarios group, technical sister to VARTA) builds an **AGM with spiral-wound cells** instead of flat plates. Each cell is a tight cylinder of two 99.99% pure lead foils with a high-pressure-wound AGM separator. The result: **up to 15x more vibration resistance** than a flat battery, hundreds of cycles down to 80% depth of discharge without damage and the ability to mount at **any angle** — including fully inverted. This makes them the logical choice for extreme-use profiles: 4x4 with electric winch, off-road with constant vibration, cars with competition audio (1,000+ W), hot rods with tight underbonnet space, restomodded classics, small-to-mid-size boats with house loads, low-capacity solar banks. ## The three Optima lines | Line | Colour | Function | Capacity | Typical CCA | Top models | |---|---|---|---|---|---| | Red Top | Red | Pure starting — maximum CCA | 38-50 Ah | 720-815 A | RT R-3.7, RT S-4.2, RT 75/35 | | Yellow Top | Yellow | Dual: starting + deep cycle | 38-75 Ah | 660-975 A | YT S-4.2, YT D-4.2, YT D-31T | | Blue Top | Blue | Marine — SAE + threaded dual post | 50-75 Ah | 815-975 A | BT D-31M, BT D-34M | ### When to pick each Optima - [Optima Red Top](https://baterias.com/gb/batteries-optima-red-top) — pure starting at maximum CCA. Best for cars/trucks without high parked loads but a demanding engine. Hot rod, big diesel, track day. - [Optima Yellow Top](https://baterias.com/gb/batteries-optima-yellow-top) — dual purpose, starting + deep cycle. Preferred for 4x4 with winch, competition audio, modified cars with many accessories, small motorhome. - [Optima Blue Top](https://baterias.com/gb/batteries-optima-blue-top) — marine version with dual post (SAE for cranking, threaded for house loads). Boat, jet-ski. ### Best-selling Optima models - **Optima YT S-4.2** — Yellow Top 55Ah 765A. The most universal Yellow, fits standard European tray. - **Optima YT D-4.2** — Yellow Top dual 55Ah 765A with side terminal. Competition audio, modified. - **Optima YT D-31T** — Yellow Top 75Ah 975A. Big 4x4 with winch, small motorhome. - **Optima RT R-3.7** — Red Top 44Ah 720A. Pure cranking, hot rod, restored sports car. - **Optima RT S-4.2** — Red Top 50Ah 815A. Demanding cranking, standard SAE post. - **Optima BT D-31M** — Blue Top marine 75Ah 900A dual post. Boat and jet-ski. ### Optima vs conventional AGM A high-end flat AGM (Varta Silver Dynamic AGM, Tudor AGM Microhybrid) covers 95% of standard Start-Stop cars and is the right choice if your vehicle has no special demands. **Optima shines when there is extreme vibration, recurring deep cycling or need for non-standard mounting** — no flat AGM matches SpiralCell there. The trade-off is price: an Optima costs 2-3x what an equivalent flat AGM does. ### Frequently asked questions ### **Which Optima for my 4x4 with winch?** Yellow Top D-31T (75Ah 975A) or D-31A depending on tray. The Yellow handles winch-induced deep cycling without premature ageing. ### **Does Optima work for a normal car?** Yes, a Red Top R-3.7 fits the standard tray and delivers maximum CCA. But if your car is just Start-Stop with no special demands, a conventional flat AGM covers it for less money. ### **Can I mount it upside down?** Yes, Optima SpiralCell is the only AGM family rated for any mounting angle, including fully inverted. Useful in hot rods and special installs. ### **How long does an Optima last?** 8-10 years in normal use with seasonal float charge. Optima publishes 24-36-month limited warranty depending on line, but real-world life with proper maintenance is much longer. ### **Is Optima Yellow Top good for car audio?** It's exactly what competition audio asks for: repeated deep discharge without damage and fast charge acceptance from the alternator between tracks. The Yellow Top D-4.2 is the most popular SPL/SQ choice. ### **How long does shipping take?** Standard delivery **1 to 5 working days** to your country. We process orders within 24h. Optima catalogue curated by our technical team. **12,231 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. ## Products in this category | Product | Brand | Price | |---|---|---| | [Caravan battery Optima YTS-5.5 12V 75Ah 975A AGM](https://baterias.com/gb/battery-optima-yellow-top-yts-55-8051-187-12v-75ah) | OPTIMA | 261,10 € | | [Car battery Optima RTC-4.2 12V 50Ah 815A AGM](https://baterias.com/gb/battery-optima-red-top-rtc-42-8001-287-12v-50ah) | OPTIMA | 185,80 € | | [Marine battery Optima BTDC-5.5 12V 75Ah 975A AGM](https://baterias.com/gb/battery-optima-blue-top-btdc-55-8052-188-12v-75ah) | OPTIMA | 263,70 € | | [Car battery Optima RTS-4.2 12V 50Ah 815A AGM](https://baterias.com/gb/battery-optima-red-top-rts-42-8002-250-12v-50ah) | OPTIMA | 187,40 € | | [Marine battery Optima BTDC-4.2 12V 55Ah 765A AGM](https://baterias.com/gb/battery-optima-blue-top-btdc-42-8016-253-12v-55ah) | OPTIMA | 216,90 € | | [Caravan battery Optima YTS-4.2 12V 55Ah 765A AGM](https://baterias.com/gb/battery-optima-yellow-top-yts-42-8012-254-12v-55ah) | OPTIMA | 213,80 € | | [Car battery Optima RTS-2.1 6V 50Ah 815A AGM](https://baterias.com/gb/battery-optima-red-top-rts-21-8010-355-12v-50ah) | OPTIMA | 163,60 € | | [Caravan battery Optima YTU-4.2 12V 55Ah 765A AGM](https://baterias.com/gb/battery-optima-yellow-top-ytu-42-8014-254-12v-55ah) | OPTIMA | 210,80 € | | [Car battery Optima RTU-4.2 12V 50Ah 815A AGM](https://baterias.com/gb/battery-optima-red-top-rtu-42-8004-250-12v-50ah) | OPTIMA | 185,80 € | | [Car battery Optima RTU-3.7 12V 44Ah 730A AGM](https://baterias.com/gb/battery-optima-red-top-rtu-37-8022-255-12v-44ah) | OPTIMA | 187,30 € | | [Auxiliary battery Optima YTR-2.7 12V 38Ah 460A AGM](https://baterias.com/gb/battery-optima-yellow-top-ytr-27-8073-176-12v-38ah) | OPTIMA | 214,50 € | | [Marine battery Optima BTSLI-4.2 12V 50Ah 815A AGM](https://baterias.com/gb/battery-optima-blue-top-btsli-42-8006-252-12v-50ah) | OPTIMA | 181,50 € | | [Car battery Optima RTR-3.7 12V 44Ah 730A AGM](https://baterias.com/gb/battery-optima-red-top-rtr-37-8035-255-12v-44ah) | OPTIMA | 191,90 € | | [Car battery Optima YTS-2.1 6V 55Ah 765A AGM](https://baterias.com/gb/battery-optima-yellow-top-yts-21-8018-356-12v-55ah) | OPTIMA | 161,40 € | | [Car battery Optima RTR-4.2 12V 50Ah 815A AGM](https://baterias.com/gb/battery-optima-red-top-rtr-42-8003-251-12v-50ah) | OPTIMA | 209,90 € | ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2012. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-10-27*