# Car battery Optima RTS-3.7 12V 44Ah 730A AGM

![Car battery Optima RTS-3.7 12V 44Ah 730A AGM](https://baterias.com/3825-home_default/battery-optima-red-top-rts-37-8020-255-12v-44ah.jpg)

> Optima RTS-3.7 car battery 12V 44Ah 730A AGM. RED TOP range. Dimensions 237×172×197 mm, + terminal on the left. Check fitment by plate.

**Category:** [Car Batteries](https://baterias.com/gb/car-batteries) → [OPTIMA](https://baterias.com/gb/optima)

- **Canonical URL**: https://baterias.com/gb/battery-optima-red-top-rts-37-8020-255-12v-44ah
- **Language**: en-GB
- **Brand**: OPTIMA
- **Reference**: BCOM-OPTIMA-RTS-3.7
- **EAN**: 4016987113554
- **MPN**: RTS-3.7
- **Price**: 190,80 €
- **Stock**: In stock

## Technical specifications

| Feature | Value |
|---|---|
| Brand | OPTIMA |
| Reference | RTS-3.7 |
| Model | OPTIMA RED TOP |
| Voltage (V) | 12 V |
| Largo | 237 mm |
| Ancho | 172 mm |
| Alto | 168 mm |
| Peso | 15.6 kg |
| Tecnología | AGM ESPIRAL |
| EAN | 4016987113554 |
| Terminal layout | Positive terminal on the left |
| Terminal type | 1 |
| Hold down | B1 |
| Cold cranking amps (EN) | 730 A |
| Capacity (C20) | 44 Ah (c20) |
| ETN | 8202550008882 |

## Quick description

**Optima RTS-3.7 12V 44Ah 730A** is a ready-to-use passenger car battery, sealed and maintenance-free. Delivers the cranking amps the engine needs in cold weather and keeps stable voltage for modern car loads (ECU, sensors, climate control, infotainment).

## Why this car battery?

- **Original-equipment quality** without dealership prices
- **Lasts 4 to 6 years** buy once instead of twice
- **Real human tech support** if you have any doubts before buying

🔌 Voltage
12 V

⚡ Capacity
44 Ah C20

🔋 Cold cranking
730 A EN-1

📏 Dimensions
237×172×197 mm

⚙️ Technology
AGM ESPIRAL

🧭 Polarity
Positive on the left

⚖️ Weight
15,6 kg

🏷️ Model
OPTIMA RED TOP

## Description

## Car battery Optima RTS-3.7 Red Top 44Ah 730A 12V

12*V* Voltage
44*Ah* Capacity
730*A* Cold cranking
15.60*kg* Weight

The **Optima RTS-3.7 car battery** is rated at **12 V**, **44 Ah** and **730 A** of cold cranking current (EN) from the **Red Top** range, and is designed for passenger cars with conventional starting, without a Start-Stop system. Measuring 237 × 172 × 168 mm and the positive terminal on the left, it is the direct replacement for cars fitted from the factory with a 44 Ah battery of this format.
- Low self-discharge: copes with long stops without losing charge.
- Designed to last several years under normal daily use.
- Spiral AGM construction, sealed and mountable in any position.
- Stable voltage for the vehicle electronics (ECU, sensors, climate control).

### Vehicles compatible with the Optima RTS-3.7

According to our database, the Optima RTS-3.7 equips more than 43 vehicles from brands such as Dodge, Ford, Jeep, Chrysler, Chevrolet and Lexus, among others. It is a go-to option when you need a **battery for a Dodge**, Ford or other models that use this same format. Models from Scion and Case Ih are added to that list.

### The Optima RTS-3.7: Red Top range and spiral-cell AGM technology

Within the Optima catalogue, the **Red Top** series groups the references designed for this use. The RTS-3.7 is the 44 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.

### Will it fit your current battery tray?

In terms of format, the Optima RTS-3.7 measures 237 × 172 × 168 mm (length × width × height) and weighs 15.60 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 a B1 hold-down and 1 terminals, the system that anchors and connects it in the vehicle. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery.

### 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.

### Usage and maintenance tips

Avoid leaving lights or accessories on with the engine off: most batteries fail not through defects but through repeated deep discharges. Charge with a voltage-controlled AGM charger; a fully discharged pure-lead battery may need a specific charger to recover.

### Manufacturer's warranty

The Optima RTS-3.7 comes with the **manufacturer's official warranty** against manufacturing defects; the exact period is stated in the brand's conditions. If it fails through a defect within the period, we replace it free of charge.

### When you get it and how to return it

Same-day dispatch from our warehouse for in-stock orders placed **before [[ks:cutoff]]**: 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 **[[ks:return_days]] days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email.

## Frequently asked questions

### Is the RTS-3.7 model AGM? What does this technology offer?

Yes. The RTS-3.7 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 cars with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions.

### Is the Optima RTS-3.7 battery suitable for Start-Stop?

Yes. As AGM technology it is designed for Start-Stop vehicles. AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. EFB is recommended for basic Start-Stop; AGM is recommended when regenerative braking is also present, thanks to its higher cycle capability. It works straight out of the box — on most modern vehicles registering the battery via OBD is recommended so the alternator automatically applies the optimal charging profile.

### How do I change this battery step by step?

In most cars 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 cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.

### How long does the Optima RTS-3.7 battery last?

Expected lifespan of the Optima RTS-3.7 is 5 to 8 years in mild-climate car 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 RTS-3.7 battery?

Dimensions (length × width × height) are 237×172×197 mm — also written as 237x172x197 mm — following the European DIN standard. Always measure the space in your car 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 RTS-3.7 and its ETN code is 8202550008882 (short form 820 255 000), the European identifier used in spare-part catalogues. The EAN-13 barcode is 4016987113554. It belongs to the OPTIMA RED TOP range. Any of these codes identifies exactly this battery when requesting quotes or comparing prices.

### Is the RTS-3.7 valid for my vehicle?

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 RTS-3.7 fits 39 verified vehicle versions in our database.

### Which batteries are equivalent to the Optima RTS-3.7?

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 cars. See the "Equivalents" section to view recommended options at the same performance level.

### What advantages does the Optima RTS-3.7 AGM battery offer over an EFB?

AGM (Absorbent Glass Mat) technology uses absorbent fibreglass that retains the electrolyte, eliminating leaks and allowing up to 3× more charge/discharge cycles than a conventional battery. It is the recommended option when the car has advanced Start-Stop with regenerative braking (BMW EfficientDynamics, Mercedes Eco, Audi MHEV, Land Rover ECO, Volvo i-Stop). Withstands tilted positions, high vibration and extreme temperatures better than EFB. The Optima RTS-3.7 is fully original and meets European EN 50342-6 standards for advanced Start-Stop.

### Will my car recognise the new battery automatically?

On most cars it is not strictly necessary — the alternator detects the new battery and adapts the charge automatically. It is recommended to register the battery via OBD so that the alternator applies the optimal charging profile from the first minute and extends the battery life as much as possible (especially on brands with sophisticated BMS: BMW, Mercedes, Audi, Volvo, Land Rover). Any workshop with an OBD scanner (~10-15 € labour) does it in 5 minutes. DIY apps: VCDS / Carista (VAG), Bimmercode (BMW), iCarsoft. If you do not register, the car will still start correctly — the alternator just takes a few days to adjust the profile. The Optima RTS-3.7 ships factory-charged at 80-90% so you can use it straight after fitting.


## Compatible vehicles

This battery fits 39 vehicles. Most searched:

- [DODGE DAKOTA (1990)](https://baterias.com/gb/car-batteries/dodge/dakota)
- [FORD RANGER Standard Cab Pickup (1997)](https://baterias.com/gb/car-batteries/ford/ranger-standard-cab-pickup)
- [JEEP COMPASS (MK49) (2006)](https://baterias.com/gb/car-batteries/jeep/compass-mk49)
- [FORD RANGER Crew Cab Pickup (ES) (1997)](https://baterias.com/gb/car-batteries/ford/ranger-crew-cab-pickup-es)
- [DODGE CALIBER (2006)](https://baterias.com/gb/car-batteries/dodge/caliber)
- [FORD F-100 (1993)](https://baterias.com/gb/car-batteries/ford/f-100)
- [DODGE INTREPID (1992)](https://baterias.com/gb/car-batteries/dodge/intrepid)
- [CHEVROLET UPLANDER (2004)](https://baterias.com/gb/car-batteries/chevrolet/uplander)
- [CHRYSLER CONCORDE (1992)](https://baterias.com/gb/car-batteries/chrysler/concorde)
- [CHRYSLER PACIFICA (2003)](https://baterias.com/gb/car-batteries/chrysler/pacifica)
- [LEXUS HS (ANF10) (2009)](https://baterias.com/gb/car-batteries/lexus/hs-anf10)
- [CHRYSLER LHS Saloon (1993)](https://baterias.com/gb/car-batteries/chrysler/lhs-saloon)
- [SCION xB MPV (2003)](https://baterias.com/gb/car-batteries/scion/xb-mpv)
- [SCION xA Hatchback (2003)](https://baterias.com/gb/car-batteries/scion/xa-hatchback)
- [CASE IH Series CVX (1990)](https://baterias.com/gb/batteries-for-construction-and-agricultural-machinery/case-ih/series-cvx)

## Technical team (editorial authorship)

The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2015.

→ https://baterias.com/gb/technical-team

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*baterias.com — Automotive batteries · 2026-10-09*