# OPTIMA YELLOW TOP Batteries > OPTIMA Yellow Top SpiralCell AGM dual-purpose: cranking + deep cycle. 38-75 Ah, CCA 460-975 A. YT S 4.2, YT S 5.5, D34/78. 4x4, audio, RV. 24h delivery. **Category:** [Start](https://baterias.com/gb/beginning) → [Batteries](https://baterias.com/gb/batteries) → [OPTIMA batteries](https://baterias.com/gb/batteries-optimal) - **Canonical URL**: https://baterias.com/gb/batteries-optima-yellow-top - **Language**: en-GB ## Description **OPTIMA Yellow Top batteries**: dual-purpose AGM SpiralCell for cars with high-power audio, 4x4 with winch, modified vehicles with auxiliary loads and motorhomes. 38-75 Ah, CCA 460-975 A. Unique **SpiralCell** technology — spiral-wound plates with 15x the vibration and deep-cycle resistance of conventional AGM. Key models: YT S 4.2, YT S 5.5, D34/78 YellowTop, D31A, D31T, D75/25. ## OPTIMA Yellow Top — dual-purpose AGM SpiralCell The difference vs classic AGM is the **SpiralCell geometry**: instead of flat plates, Yellow Top uses 99.99% pure lead spiral-wound plates. Result: **350+ cycles at 80% DoD** (3-4x flat AGM), tolerates extreme vibration (off-road, marine), works in any orientation. ### Models and applications Model Ah (C20) CCA Typical application YT S 4.2 55 765 Cars with HiFi competition audio, modified YT S 5.5 75 975 4x4 with winch, extreme audio, motorhome D34/78 YellowTop 55 750 American pick-up (Jeep, Dodge), modified JDM D31A YellowTop 75 900 Big pick-up, 4x4 expedition, RV D75/25 YellowTop 48 620 Classic American restomod ### Yellow Top vs Red Top vs Blue Top **Yellow Top (dual-purpose)**: cranking + deep cycle. Modified cars with audio, winch, 12V fridge. [ **Red Top (starter)** ](/gb/batteries-optima-red-top): cranking only. Cars without heavy auxiliary loads. [ **Blue Top (marine)** ](/gb/batteries-optima-blue-top): same as Yellow Top but with marine terminal + white case for boats. ### Why Optima over a conventional AGM - **Vibration**: SpiralCell tolerates vibration that would crack flat plates (off-road, racing, rough marine). - **Deep cycle**: 350-400 cycles at 80% DoD vs 100-150 cycles on conventional flat AGM. - **99.99% pure lead**: 1-2% per month self-discharge (vs 5-15% for lead-antimony or standard calcium). Survives months unused without sulphation. - **Any angle**: mountable on its side or upside-down (terminal not facing down). Ideal for atypical compartments. ### Frequently asked questions ### **Can Yellow Top be used as a normal starter battery?** Yes, perfectly. CCA is enough to crank any car. Pick it when you also want deep-cycle capability (audio, winch, fridge, motorhome). ### **Does it need coding?** If your car needs AGM and has a BMS, yes — the management system must know it is AGM. Yellow Top is BMS-valid AGM. ### **How long does it last?** 5-8 years in normal use. 3-5 years in extreme use (competition audio, off-road). ### **Why pricier than a normal AGM?** SpiralCell is a different process plus 99.99% pure lead. The premium pays back in extra service years and in applications where flat AGM would fail. ### **How long does shipping take?** Standard delivery **1 to 5 working days** to your country. We process orders within 24h. OPTIMA Yellow Top catalogue curated by our technical team. **11,154 Trustpilot reviews · 4.5/5**. 24h mainland delivery, free 14-day returns. ## 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 | 260,45 € | | [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 | 213,10 € | | [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 | 210,15 € | | [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 | 154,20 € | | [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 | 160,75 € | | [Caravan battery Optima YTR-5.0 12V 66Ah 845A AGM](https://baterias.com/gb/battery-optima-yt-r-50-12v-66ah-845a-845a) | OPTIMA | 261,06 € | | [Caravan battery Optima YTR-3.7 12V 48Ah 660A AGM](https://baterias.com/gb/battery-optima-yellow-top-ytr-37-8040-222-12v-48ah) | OPTIMA | 203,10 € | | [Auxiliary battery Optima YTS-2.7J 12V 38Ah 460A AGM](https://baterias.com/gb/battery-optima-yellow-top-yts-27j-8070-176--12v-38ah) | OPTIMA | 191,14 € | | [Auxiliary battery Optima YTS-2.7 12V 38Ah 460A AGM](https://baterias.com/gb/battery-optima-yellow-top-yts-27-8071-176-12v-38ah) | OPTIMA | 154,20 € | | [Auxiliary battery Optima YTR-2.7J 12V 38Ah 460A AGM](https://baterias.com/gb/battery-optima-yellow-top-ytr-27j-8072-176-12v-38ah) | OPTIMA | 206,99 € | ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-08-16*