Summary: Put simply: Optima YTS-4.2, rated 55Ah 12V 765A, sold for boats and motorhomes. Every figure that decides the fit is in the table below.
12VNominal voltage
55AhCapacity, 20-hour rate (C20)
765AStarting power (EN)
Optima YTS-4.2 for boats and motorhomes
Built for life on board boats and motorhomes, the Optima YTS-4.2 keeps lights and pumps going. With the positive on the left-hand side, the main leads should land where the old ones did. The code from the old battery is all the search box needs.
Among batteries for boats and motorhomes, 55Ah is at the smaller end. Big diesels and cold climates appreciate the 765A on offer here.
Optima YTS-4.2: dimensions and ratings
ManufacturerOptima
ReferenceYTS-4.2
RangeOPTIMA YELLOW TOP
Applicationboats and motorhomes
Nominal voltage12V
Capacity, 20-hour rate (C20)55Ah
Starting power (EN)765A
Battery technologySpiral-cell AGM
Dimensions (L × W × H)254 × 175 × 200 mm
Battery weight20.3 kg
Polaritypositive on the left-hand side
EAN4016987113523
Fitting and everyday care
A yacht on a mooring all winter needs its batteries checked before launch. Strap the battery down as firmly as you would the engine. Old and new batteries side by side make a weak team.
How spiral-cell AGM batteries work and how to look after them
The unusual shape is the giveaway of a spiral-cell battery. Spiral batteries power winches and lights well. Deeply drained spiral cells may need a recovery function to wake up.
Make sure it fits your vehicle or equipment
- ✓ Check the EN figure on your old label against 765A.
- ✓ Check that the alternator or controller suits spiral-cell AGM.
- ✓ Check 254 × 175 × 200 mm against the tray, not just the old battery.
Questions and answers
How big and heavy is this Optima battery?
Overall it is 254 × 175 × 200 mm (L × W × H) and tips the scales at 20.3 kg. Weight is a good clue to how much active material is inside.
How do capacity and cranking amps compare with my old battery?
55Ah indicates how much charge it stores, 765A how much current it can deliver in a cold start. Both should be at least equal to the original.
What are the voltage and capacity of this model?
It is a 12V battery with a capacity of 55Ah. In banks of several units, connect only identical batteries bought at the same time.
Alternatives that fit the same space
Other references from our catalogue with the same measurements and terminal position.
Optima BTDC-4.2Optima YTU-4.2Optima BTSLI-4.2
Explore more
Codes matching and measurements agreeing? The Optima YTS-4.2 can go straight into your basket at baterias.online. Measuring the space before ordering avoids a battery that will not sit flat.
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