Optima
Optima RTU-4.2 · Car battery 12V 50Ah 815A
Reference: BOL-OPTIMA-RTU-4.2 · EAN 4016987113486
The Optima RTU-4.2 (ETN 804 250 000, also written 804250000) is a car battery (spiral AGM) with 12 V, 50 Ah and 815 A cold cranking current, measuring 254 × 175 × 200 mm, with the positive terminal on the left. With the positive terminal on the right, the exact counterpart is the Optima RTR-4.2.
Optima RTU-4.2 · Car battery 12V 50Ah 815A images
- Voltage
- 12V
- Capacity
- 50Ah
- Cold cranking amps (EN)
- 815A
- Technology
- Spiral AGM
- Dimensions (L × W × H)
- 254 × 175 × 200 mm
- Polarity
- Positive terminal on the left
Price:
€181.81
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14 days to return your order
If it does not fit, you have 14 days from delivery to return it unused.
Does it fit your vehicle? Check by number plate or VIN
Enter your number plate or chassis number (VIN): we check whether this battery is compatible with your vehicle.
The Optima RTU-4.2 at a glance
The Optima RTU-4.2 is a starter battery for cars without Start-Stop: it delivers the current the starter motor needs and then powers lights, control units and audio with the engine off. The RTU-4.2 covers the daily routine of a car without automatic engine stop: cold starts, short trips and loads with the ignition off.
At 50 Ah it covers petrol compacts and small diesels, the best-selling format in Europe. The RTU-4.2 belongs to the Optima OPTIMA RED TOP range. See all Optima batteries
Optima RTU-4.2 vs RTS-3.7, RTR-4.2 and RTU-3.7: which one to choose?
Torn between the RTU-4.2 and another similar Optima? This is what changes:
| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Optima RTU-4.2 (this one) | 50 Ah | 815 A | 254 × 175 × 200 | left | 18.4 kg |
| Optima RTS-3.7 | 44 Ah | 730 A | 237 × 172 × 197 | left | 15.6 kg |
| Optima RTR-4.2 | 50 Ah | 815 A | 254 × 175 × 200 | right | 18 kg |
| Optima RTU-3.7 | 44 Ah | 730 A | 237 × 172 × 197 | left | 15.7 kg |
- Optima RTS-3.7: 6 Ah less, 85 A less cranking power, a different case (237 × 172 × 197 mm).
- Optima RTR-4.2: identical to the RTU-4.2 except for the positive terminal, which is on the other side (positive terminal on the right).
- Optima RTU-3.7: 6 Ah less, 85 A less cranking power, a different case (237 × 172 × 197 mm).
Optima RTU-4.2 codes and part numbers
Look for any of these RTU-4.2 codes on your current battery or in the manufacturer's catalogue:
| Commercial reference | RTU-4.2 |
|---|---|
| ETN code | 804250000 (also 804 250 000) |
| EAN | 4016987113486 |
| Same ETN as | Optima RTF-4.2 |
| Case size according to Optima | 34/78 (BCI) |
| Base hold-down | B00 |
| Terminal type | 1 & 21 |
| Also known as | Optima 804250000 · Optima 804 250 000 |
| Not to be confused with | Optima RTC-4.2 (50 Ah, 815 A), Optima RTR-4.2 (50 Ah, 815 A, positive terminal on the right), Optima YTU-4.2 (55 Ah, 765 A) |
Equivalents and alternatives to the Optima RTU-4.2
As the RTU-4.2 is an AGM battery, we only list other AGM batteries with its dimensions and polarity: neither an EFB nor a conventional battery can replace it.
| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Optima RTC-4.2 | Spiral AGM | 50 Ah | 815 A | 254 × 175 × 200 |
| Optima RTS-4.2 | Spiral AGM | 50 Ah | 815 A | 254 × 175 × 200 |
Check this before ordering the Optima RTU-4.2
- The RTU-4.2 needs 254 × 175 × 200 mm of space: measure it with the hold-down clamp in place.
- Polarity of the RTU-4.2: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Your current battery should say about 50 Ah; a little more is also fine.
- Check the EN amps on your battery: if it says 815 A or less, the RTU-4.2 covers your engine.
- The RTU-4.2 is AGM: it replaces an AGM or an EFB of the same size. You can swap an EFB for an AGM, but not an AGM for an EFB.
What it means that the RTU-4.2 is spiral AGM
The RTU-4.2 is a spiral-cell AGM battery. Perfect for 4x4s, marine use and vehicles with lots of electronics.
Frequently asked questions about the Optima RTU-4.2
Optima RTU-4.2 or RTS-3.7?
Compared with the RTU-4.2, the Optima RTS-3.7 has 6 Ah less and 85 A less cranking power. The RTU-4.2 cranks harder; the RTS-3.7 is only a good option if your original battery says 730 A or less. Mind the space: the RTS-3.7 measures 237 × 172 × 197 mm.
What is the difference between the Optima RTU-4.2 and the RTR-4.2?
They are the same battery with the terminals swapped: positive terminal on the left on the RTU-4.2, positive terminal on the right on the RTR-4.2. Look at your current battery with the terminals facing you and pick the one that matches. That is why their ETNs only differ in the middle group: 804 250 000 for the RTU-4.2 and 803 251 000 for the RTR-4.2.
What is the ETN code of the Optima RTU-4.2?
804250000, also written 804 250 000. The ETN (European Type Number) is printed on the label and used in parts catalogues.
Can the Optima RTU-4.2 be used in a car with Start-Stop?
Yes. As an AGM battery, the RTU-4.2 handles automatic engine stop and brake energy recovery, and it can replace an EFB of the same size.
How much does the Optima RTU-4.2 weigh?
The RTU-4.2 weighs 18.4 kg. For reference, the Optima RTS-3.7 (44 Ah) weighs 15.6 kg.
Which battery is equivalent to the Optima RTU-4.2?
Only other AGM batteries with its dimensions and polarity: Optima RTC-4.2 and Optima RTS-4.2. Neither an EFB nor a conventional battery replaces the RTU-4.2.
More batteries to compare with the RTU-4.2
- Other car batteries
- More Optima models
- Optima RTC-4.2 · 50 Ah, 815 A, 254×175×200 mm
- Optima RTS-4.2 · 50 Ah, 815 A, 254×175×200 mm
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