# Caravan battery Optima YTS-4.2 Yellow Top 12V 55Ah 765A AGM ![Caravan battery Optima YTS-4.2 Yellow Top 12V 55Ah 765A AGM](https://baterias.com/3854-home_default/battery-optima-yellow-top-yts-42-8012-254-12v-55ah.jpg) > Optima YTS-4.2 caravan battery 12V 55Ah 765A AGM. YELLOW TOP range. Dimensions 254×175×200 mm, + terminal on the left. For your on-board services. **Category:** [Batteries for Caravans](https://baterias.com/gb/batteries-for-caravans) → [OPTIMA](https://baterias.com/gb/optima) - **Canonical URL**: https://baterias.com/gb/battery-optima-yellow-top-yts-42-8012-254-12v-55ah - **Language**: en-GB - **Brand**: OPTIMA - **Reference**: BCOM-OPTIMA-YTS-4.2 - **EAN**: 4016987113523 - **MPN**: YTS-4.2 - **Price**: 213,80 € (VAT incl., Spain) - **Last updated**: 2026-10-29 - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | OPTIMA | | Reference | YTS-4.2 | | Model | OPTIMA YELLOW TOP | | Voltage (V) | 12 V | | Largo | 254 mm | | Ancho | 172 mm | | Alto | 173 mm | | Peso | 20.3 kg | | Tecnología | AGM ESPIRAL | | EAN | 4016987113523 | | Terminal layout | Positive terminal on the left | | Terminal type | 1 | | Cold cranking amps (EN) | 765 A | | Capacity (C20) | 55 Ah (c20) | | Capacity (C5) | 52 Ah (c5) | | ETN | 8122540008882 | ## Quick description **Optima YTS-4.2 12V 55Ah 765A** is a leisure battery for campers, motorhomes and caravans. Designed to power the entire interior kit (fridge, heater, water pump, USB, LED lighting) for several days off-grid, with no need to plug into a campsite hookup. ## Why this caravan battery? - **Real off-grid autonomy** no campsite hookup needed - **Lasts the whole season** handles daily discharges without capacity loss - **Powers it all at once** fridge, water pump, LED and USB without issues 🔌 Voltage 12 V ⚡ Capacity 55 Ah C20 🔋 Cold cranking 765 A EN-1 📏 Dimensions 254×175×200 mm ⚙️ Technology AGM ESPIRAL 🧭 Polarity Positive on the left ⚖️ Weight 20,3 kg 🏷️ Model OPTIMA YELLOW TOP ## Description ## Leisure battery Optima YTS-4.2 Yellow Top 55Ah 765A 12V 12*V* Voltage 55*Ah* Capacity 765*A* Cold cranking 20.30*kg* Weight The **12 V**, **55 Ah** **Optima YTS-4.2** battery from the **Yellow Top** range with spiral-cell AGM technology is designed for motorhomes, caravans and campers that need power off-grid. Measuring 254 × 172 × 173 mm and the positive terminal on the left, it is the direct replacement for motorhomes and caravans fitted from the factory with a 55 Ah battery of this format. - Spiral AGM construction, sealed and mountable in any position. - Withstands daily discharges throughout the season. - Recharges from the alternator, a solar panel or a mains charger. - Direct replacement for the original leisure battery. ### What the Optima YTS-4.2 is for With 55 Ah, the Optima YTS-4.2 is the habitation battery for motorhomes, caravans and campers that need power off-grid. It recharges from the alternator, a solar panel or a mains charger. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 20.30 kg and 1 terminals. ### The Optima YTS-4.2: Yellow Top range and spiral-cell AGM technology Within the Optima catalogue, the **Yellow Top** series groups the references designed for this use. The YTS-4.2 is the 55 Ah model of that family, with the same performance as its siblings in other sizes. In a spiral-cell battery the electrolyte is absorbed and the plates are wound under pressure. That lets it deliver very high current peaks, recharge quickly and be mounted in any position. ### Size, terminals and hold-down of the Optima YTS-4.2 In terms of format, the Optima YTS-4.2 measures 254 × 172 × 173 mm (length × width × height) and weighs 20.30 kg. The positive terminal on the left decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses 1 terminals, the system that anchors and connects it in the vehicle. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters. ### What Optima does differently The Optima Red, Yellow and Blue Top are references for high-performance starting, deep cycling and marine use respectively, all with the characteristic six spiral-cell design. We guarantee that every Optima arrives new, charged and with the manufacturer's full warranty. ### Care and maintenance Avoid routinely discharging the leisure battery below 50% and recharge it fully after every trip. During months of storage, keep it charged with a mains charger or a small solar panel; a battery left discharged for weeks loses capacity permanently. ### Warranty and coverage The Optima YTS-4.2 comes with the **manufacturer's official warranty** against manufacturing defects. Avoid repeated full discharges: they shorten its life and are not covered. ### Shipping, delivery and returns Order **before 6:00 pm** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **14 days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email. ## Frequently asked questions ### Is this battery AGM? What is it for? Yes: the YTS-4.2 from Optima uses AGM (Absorbent Glass Mat) technology, a sealed lead-acid battery whose electrolyte soaks a glass-fibre mat. Its advantages: more charge/discharge cycles than a conventional battery and better heat tolerance. ### How much energy does this battery give a caravan? It stores about 660 Wh. To make it last, it should not be discharged below half, so you have about 330 Wh usable: for example, an average load of 50 W for about 7 hours. ### Can it be charged with solar panels? Yes, with a charge controller (PWM or MPPT) set for AGM. It can also be charged by the vehicle alternator (ideally with a DC-DC charger) and by the 230 V charger when you are on hook-up at the campsite. ### What are the dimensions of the Optima YTS-4.2 battery? Before buying, measure the space in your caravan: one extra millimetre can stop the hold-down clamp from closing. The Optima YTS-4.2 takes up 254×175×200 mm (length, width and height, terminals included). ### What polarity does the Optima YTS-4.2 battery have? On the Optima YTS-4.2, the polarity is positive on the left. It must match your current battery: reversed polarity means lengthening cables or reconfiguring the system, with a risk of short circuit. To check, stand the battery in front of you with the terminals nearest you: the positive (+) is the one with the red ring. ### What barcode does this battery have? Parts catalogues list it under ETN 812 254 000 (in full, 8122540008882); the manufacturer's reference is YTS-4.2 and its EAN-13 is 4016987113523. It belongs to the OPTIMA YELLOW TOP range. Any of the three works for getting a quote or comparing prices without mix-ups. ### Optima YTS-4.2 or Optima YTU-4.2: which one to choose? It has the same dimensions, voltage and technology as the YTS-4.2, although it is not a manufacturer-approved equivalent. Compared with the YTS-4.2 it has the same Ah and cranking power. It costs 3,00 € less. Check the positive terminal side and the original capacity before ordering; otherwise it is a straight swap. ## Compatible vehicles The Optima YTS-4.2 fits 1 vehicles (5 engine versions), including the LTI TX D (81 kW / 110 CV) (1997–2025), LTI TX 2.5 TD (75 kW / 102 CV) (1997–2025), LTI TX 2.4 i (112 kW / 152 CV) (1997–2025) and LTI TX 2.4 TDi (66 kW / 90 CV) (1997–2025). | Make | Model | Engine | Years | |---|---|---|---| | LTI | TX | [D (81 kW / 110 CV)](https://baterias.com/gb/car-batteries/lti/tx/d-81-kw-110cv) | 1997–2025 | | LTI | TX | [2.5 TD (75 kW / 102 CV)](https://baterias.com/gb/car-batteries/lti/tx/25-td-75-kw-102cv) | 1997–2025 | | LTI | TX | [2.4 i (112 kW / 152 CV)](https://baterias.com/gb/car-batteries/lti/tx/24-i-112-kw-152cv) | 1997–2025 | | LTI | TX | [2.4 TDi (66 kW / 90 CV)](https://baterias.com/gb/car-batteries/lti/tx/24-tdi-66-kw-90cv) | 1997–2025 | | LTI | TX | [2.7 TD (60 kW / 82 CV)](https://baterias.com/gb/car-batteries/lti/tx/27-td-60-kw-82cv) | 1997–2025 | ## 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 · 2026-11-12*