Optima YTS-4.2 Yellow Top · Caravan battery 55Ah 765A AGM

Leisure battery Optima YTS-4.2 Yellow Top 55Ah 765A 12V

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.