Optima YTU-4.2 · Caravan battery 12V 55Ah 765A AGM
Specifications
| Brand | OPTIMA |
|---|---|
| Part number | YTU-4.2 |
| Voltage (V) | 12 |
| Capacity (C20) | 55Ah (c20) |
| Capacity (C5) | 52Ah (c5) |
| Technology | AGM ESPIRAL |
| Length | 254.00 mm |
| Width | 172.00 mm |
| Height | 173.00 mm |
€210.80
VAT included
4,79/5★★★★★31 reviewsVerified purchases
- ★★★★Alfredo Guerrero:
Web muy recomendable. En otras páginas ni cogen el teléfono.
- ★★★★★Agustin Guerrero:
No tenía ni idea de cómo instalar una batería y me ayudaron. Al final fue fácil
- ★★★★★Miguel PeÑa:
Recomiendo hablar con ellos antes de realizar un pedido en otra web
Optima YTU-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
20,6 kg
Model
OPTIMA YELLOW TOP
Leisure battery Optima YTU-4.2 Yellow Top 55Ah 765A 12V
12VVoltage
55AhCapacity
765ACold cranking
20.30kgWeight
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.
BCOM-OPTIMA-YTU-4.2
Data sheet
- Brand
- OPTIMA
- Reference
- YTU-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
- 4016987113530
- Terminal layout
- Positive terminal on the left
- Terminal type
- 1 & 21
- Cold cranking amps (EN)
- 765A
- Capacity (C20)
- 55Ah (c20)
- Capacity (C5)
- 52Ah (c5)
- ETN
- 8142540008882
Specific References
- EAN13
- 4016987113530
- MPN
- YTU-4.2
4,79/5
Verified purchasesLatest verified reviews
★★★★★Alfredo Guerrero
07/06/2026Muy recomendable
Web muy recomendable. En otras páginas ni cogen el teléfono.
★★★★★Agustin Guerrero
02/05/2026Gracias por la ayuda
No tenía ni idea de cómo instalar una batería y me ayudaron. Al final fue fácil
★★★★★Miguel PeÑa
01/05/2026Buena atención por email
Recomiendo hablar con ellos antes de realizar un pedido en otra web
★★★★★Lucas Lozano
19/04/2026Recibí la batería al día siguiente
La batería me llegó por MRW en menos de 24 horas
★★★★★Francisco Blanco
14/02/2026No tardó nada
Pedí la batería un miércoles a las 4 y me llegó el jueves a las 2
★★★★★Carlos Vicente
14/02/2026Llega al día siguiente
Todo bien, me tardó un poco más pero fue cosa de la paquetería
★★★★★Alex Dominguez
14/02/2026Se preocupan por asesorarte de la mejor manera
Usualmente no recibes un trato tan personalizado, pero en esta web me ayudaron con la elección y la instalación de la batería.
★★★★★Luis Miguel Herrero
29/01/2026La ayuda muy útil
Tenía muchas dudas sobre la instalación y me guiaron paso a paso. Atención inmejorable.
★★★★★Mariano Pascual
15/01/2026facil de comprar y llega en tiempo
Ya les había comprado una batería de moto, Ahora he pedido una de coche y me han asesorado super bien.
★★★★★Joaquin Duran
27/11/2025Muchas gracias por ayudarme
No tenía ni idea de cómo instalar una bateria y me ayudaron. Al final fue fácil
Codes and references Optima YTU-4.2
| Brand | Optima · see all batteries Optima |
|---|---|
| Manufacturer range | OPTIMA YELLOW TOP |
| Manufacturer reference (MPN) | YTU-4.2 |
| ETN code | 8142540008882 (short form 814 254 000) |
| EAN-13 barcode | 4016987113530 |
| Dimensions (length × width × height) | 254 × 175 × 200 mm (254x175x200) |
Recommended accessories
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 YTU-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 YTU-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.
How many years does this battery last?
Expected lifespan of the Optima YTU-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 YTU-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.
Under which reference is the Optima YTU-4.2 listed in catalogues?
The manufacturer reference (MPN) is YTU-4.2 and its ETN code is 8142540008882 (short form 814 254 000), the European identifier used in spare-part catalogues. The EAN-13 barcode is 4016987113530. It belongs to the OPTIMA YELLOW TOP range. Any of these codes identifies exactly this battery when requesting quotes or comparing prices.
Will the Optima YTU-4.2 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 YTU-4.2 typically fits a wide range of European vehicles thanks to its standard DIN case format.
Which batteries are equivalent to the Optima YTU-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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