Optima YTS-4.2 · Caravan battery 12V 55Ah 765A AGM
Specifications
| Brand | OPTIMA |
|---|---|
| Part number | YTS-4.2 |
| Voltage (V) | 12 |
| Capacity (C20) | 55Ah (c20) |
| Capacity (C5) | 52Ah (c5) |
| Cold cranking amps (EN) | 765A |
| Technology | AGM ESPIRAL |
| Length | 254.00 mm |
| Width | 172.00 mm |
€213.80
VAT included
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 autonomyno campsite hookup needed
- Lasts the whole seasonhandles daily discharges without capacity loss
- Powers it all at oncefridge, water pump, LED and USB without issues
Voltage
12 V
Capacity
55 Ah
Cold cranking
765 A
Dimensions
254×175×200 mm
Technology
AGM ESPIRAL
Polarity
Positive on the left
Weight
20,3 kg
Model
OPTIMA YELLOW TOP
Leisure battery Optima YTS-4.2 Yellow Top 55Ah 765A 12V
12VVoltage
55AhCapacity
765ACold cranking
20.30kgWeight
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.
BCOM-OPTIMA-YTS-4.2
Data sheet
- Brand
- OPTIMA
- Reference
- YTS-4.2
- Model
- OPTIMA YELLOW TOP
- Voltage (V)
- 12
- Length
- 254.00 mm
- Width
- 172.00 mm
- Height
- 173.00 mm
- Weight
- 20.3 Kgs
- Technology
- AGM ESPIRAL
- EAN
- 4016987113523
- Terminal layout
- Positive terminal on the left
- Terminal type
- 1
- Cold cranking amps (EN)
- 765A
- Capacity (C20)
- 55Ah (c20)
- Capacity (C5)
- 52Ah (c5)
- ETN
- 8122540008882
Specific References
- EAN13
- 4016987113523
- MPN
- YTS-4.2
Codes and references Optima YTS-4.2
| Brand | Optima · see all Optima batteries |
|---|---|
| Manufacturer range | OPTIMA YELLOW TOP |
| Manufacturer part number (MPN) | YTS-4.2 |
| Also known as | YTS4.2 · YTS 4.2 · 812254000 |
| ETN code | 8122540008882 (short form 812 254 000) |
| EAN-13 barcode | 4016987113523 |
| Dimensions (length × width × height) | 254 × 175 × 200 mm (254x175x200) |
Comparison: Optima YTS-4.2 vs equivalents
The Optima YTS-4.2 is interchangeable with these equivalent references: RTS-4.2 (Optima).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Optima
YTS-4.2
This battery
|
12V 55Ah 765A | AGM | €213.80 |
Optima
RTS-4.2
|
12V 50Ah 815A | AGM | €187.40 |
Equivalences verified by our technical team: same dimensions, polarity, capacity and CCA. Official manufacturer warranty on every option.
Recommended accessories
Compatible vehicles
The Optima YTS-4.2 fits 1 vehicles. Most searched below:
How to change the battery
Guide to replace the leisure battery of your motorhome or caravan. Estimated time 15-25 minutes. Important: isolate the 12V auxiliary system before handling.
Step 1. Switch off 12V equipment and unplug shore power
Turn off fridge, lights, water pump, Truma Mover and other auxiliary loads. Disconnect the 230V shore power and solar panels if any.
Step 2. Locate the leisure battery compartment
On motorhomes usually under the driver/passenger seat, in an outside locker or in the garage area. Verify this is NOT the engine starter battery — that one is up front with the engine.
Step 3. Disconnect the negative (−) terminal
Use the 10 mm wrench to loosen the negative cable nut (black, marked −) and remove the cable from the post. Move it aside so it cannot touch any bodywork.
Step 4. Disconnect the positive (+) terminal
Repeat with the positive cable (red, marked +). Important: never let a terminal touch metal of the car while the other is still connected.
Step 5. Remove the old battery
Loosen the bottom hold-down clamp with the same wrench. Lift the battery carefully (it can weigh 15-25 kg). Clean the tray with a brush and baking soda if there is corrosion.
Step 6. Install the new battery
Place the battery in the same orientation as the old one (positive terminal on the same side). Tighten the hold-down clamp firmly.
Step 7. Connect the cables
Connect the positive (+) terminal first, then the negative (−). Tighten the nuts with the wrench until each terminal does not move. Apply anti-spark grease if you have any.
Step 8. Verify the charger and auxiliary services
After connecting, check the combi charger (CBE/Schaudt/Nordelettronica) recognises the new battery: voltage should stabilise at 13.2-13.8 V with 230V connected. Test a couple of services (lights + pump) before heading out.
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 where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for caravans with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions.
How is the Optima YTS-4.2 battery installed in the vehicle?
In most caravans it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On caravans with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.
What is the service life of the YTS-4.2 model?
Expected lifespan of the Optima YTS-4.2 is 5 to 8 years in mild-climate caravan use with Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured.
What are the dimensions of the Optima YTS-4.2 battery?
Dimensions (length × width × height) are 254×175×200 mm — also written as 254x175x200 mm — following the European DIN standard. Always measure the space in your caravan before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.
What barcode does this battery have?
The manufacturer reference (MPN) is YTS-4.2 and its ETN code is 8122540008882 (short form 812 254 000), the European identifier used in spare-part catalogues. The EAN-13 barcode is 4016987113523. It belongs to the OPTIMA YELLOW TOP range. Any of these codes identifies exactly this battery when requesting quotes or comparing prices.
Does this battery fit my caravan?
Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The YTS-4.2 fits 1 verified vehicle versions in our database.
Which batteries are equivalent to the Optima YTS-4.2?
Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop caravans. See the "Equivalents" section to view recommended options at the same performance level.
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