Optima YTU-4.2 · Caravan battery 12V 55Ah 765A AGM

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

The Optima YTU-4.2 with spiral-cell AGM technology stores 55 Ah at 12 V: autonomy for motorhomes, caravans and campers that need power off-grid. It replaces the original battery without adaptation in motorhomes and caravans with a 254 × 172 × 173 mm format: same 55 Ah capacity and the positive terminal on the left.

• Spiral cells: maximum vibration resistance and very powerful cranking.
• Power for fridge, lighting, water pump and USB off-grid.
• Sealed and gas-free: suitable for installation inside the living area.
• Low self-discharge during months of storage.

Will it fit your current battery tray?

It has external dimensions of 254 × 172 × 173 mm 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 & 21 terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.

What the Optima YTU-4.2 is for

As a leisure battery, the Optima YTU-4.2 is discharged and recharged every travelling day; avoid discharges below 50% to extend its life. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 20.30 kg and 1 & 21 terminals.

The Optima YTU-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 YTU-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.

Optima: the maker behind the YTU-4.2

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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty.

Warranty and coverage

The Optima YTU-4.2 comes with the manufacturer's official warranty against manufacturing defects. Avoid repeated full discharges: they shorten its life and are not covered.

How to make it last longer

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. Charge with a voltage-controlled AGM charger; a fully discharged pure-lead battery may need a specific charger to recover.

Delivery times and returns

Same-day dispatch from our warehouse for in-stock orders placed before 6:00 pm: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for 14 days if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email.