Optima YTS-2.1 · Car battery 6V 55Ah 765A AGM
Specifications
| Brand | OPTIMA |
|---|---|
| Part number | YTS-2.1 |
| Voltage (V) | 6 |
| Capacity (C20) | 55Ah (c20) |
| Capacity (C5) | 52Ah (c5) |
| Cold cranking amps (EN) | 765A |
| Technology | AGM ESPIRAL |
| Length | 252.00 mm |
| Width | 90.00 mm |
€161.40
VAT included
Optima YTS-2.1 6V 55Ah 765A is a battery designed for classic and vintage vehicles. It holds steady voltage in older 6 V systems, starts reliably after long spells parked in the garage and keeps the engine bay looking original.
Why this car battery?
- Original-equipment qualitywithout dealership prices
- Lasts 4 to 6 yearsbuy once instead of twice
- Real human tech supportif you have any doubts before buying
Voltage
6 V
Capacity
55 Ah
Cold cranking
765 A
Dimensions
255×90×206 mm
Technology
AGM ESPIRAL
Polarity
Positive on the left
Weight
10,6 kg
Model
OPTIMA YELLOW TOP
Leisure battery Optima YTS-2.1 Yellow Top 55Ah 765A 6V
6VVoltage
55AhCapacity
765ACold cranking
8.90kgWeight
The Optima YTS-2.1 with spiral-cell AGM technology stores 55 Ah at 6 V: autonomy for motorhomes, caravans and campers that need power off-grid. Measuring 252 × 90 × 185 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.
- Recharges from the alternator, a solar panel or a mains charger.
- Direct replacement for the original leisure battery.
- Spiral AGM construction, sealed and mountable in any position.
- Withstands daily discharges throughout the season.
What the Optima YTS-2.1 is for
With 55 Ah, the Optima YTS-2.1 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 8.90 kg and 1 terminals.
Will it fit your current battery tray?
The Optima YTS-2.1 is made in the 252 × 90 × 185 mm format and weighs 8.90 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. 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.
The Optima YTS-2.1: Yellow Top range and spiral-cell AGM technology
The YTS-2.1 is part of the Optima Yellow Top range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family.
Spiral AGM construction winds the plates into cylindrical pure-lead cells: maximum active surface, extreme vibration resistance and cranking current far above a battery of the same size.
Optima: the maker behind the YTS-2.1
Optima makes spiral-cell (SpiralCell) AGM batteries with pure lead: maximum vibration resistance, very powerful cranking and a durability recognised in 4x4, motorsport, marine and car audio. We guarantee that every Optima arrives new, charged and with the manufacturer's full warranty.
Warranty and coverage
The Optima YTS-2.1 comes with the manufacturer's official warranty against manufacturing defects. Avoid repeated full discharges: they shorten its life and are not covered.
Usage and maintenance tips
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. Avoid routinely discharging the leisure battery below 50% and recharge it fully after every trip.
Shipping, delivery 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-YTS-2.1
Data sheet
- Brand
- OPTIMA
- Reference
- YTS-2.1
- Model
- OPTIMA YELLOW TOP
- Voltage (V)
- 6
- Length
- 252.00 mm
- Width
- 90.00 mm
- Height
- 185.00 mm
- Weight
- 8.9 Kgs
- Technology
- AGM ESPIRAL
- EAN
- 4016987124093
- Terminal layout
- 1
- Terminal type
- 1
- Cold cranking amps (EN)
- 765A
- Capacity (C20)
- 55Ah (c20)
- Capacity (C5)
- 52Ah (c5)
- ETN
- 8183560008882
Specific References
- EAN13
- 4016987124093
- MPN
- YTS-2.1
Codes and references Optima YTS-2.1
| Brand | Optima · see all Optima batteries |
|---|---|
| Manufacturer range | OPTIMA YELLOW TOP |
| Manufacturer part number (MPN) | YTS-2.1 |
| Also known as | YTS2.1 · YTS 2.1 · 818356000 |
| ETN code | 8183560008882 (short form 818 356 000) |
| EAN-13 barcode | 4016987124093 |
| Dimensions (length × width × height) | 255 × 90 × 206 mm (255x90x206) |
Recommended accessories
Compatible vehicles
The Optima YTS-2.1 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 the Optima YTS-2.1 an AGM battery and what are the benefits of AGM?
Yes. The YTS-2.1 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-2.1 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 long does the Optima YTS-2.1 battery last?
Expected lifespan of the Optima YTS-2.1 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 size is this battery?
Dimensions (length × width × height) are 255×90×206 mm — also written as 255x90x206 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 YTS-2.1 listed in catalogues?
The manufacturer reference (MPN) is YTS-2.1 and its ETN code is 8183560008882 (short form 818 356 000), the European identifier used in spare-part catalogues. The EAN-13 barcode is 4016987124093. 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 YTS-2.1 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-2.1 fits 1 verified vehicle versions in our database.
What are the equivalents of the YTS-2.1 model?
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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