Optima
Optima RTU-3.7 · Car battery 12V 44Ah 730A
Reference: BOL-OPTIMA-RTU-3.7 · EAN 4016987113561
The Optima RTU-3.7 (ETN 822 255 000, also written 822255000) is a car battery (spiral AGM) with 12 V, 44 Ah and 730 A cold cranking current, measuring 237 × 172 × 197 mm, with the positive terminal on the left. Need the positive terminal on the right? The same battery is the Optima RTR-3.7.
Optima RTU-3.7 · Car battery 12V 44Ah 730A images
- Voltage
- 12V
- Capacity
- 44Ah
- Cold cranking amps (EN)
- 730A
- Technology
- Spiral AGM
- Dimensions (L × W × H)
- 237 × 172 × 197 mm
- Polarity
- Positive terminal on the left
Price:
€183.28
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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-3.7 at a glance
The Optima RTU-3.7 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. If your car has no Start-Stop and had a 44 Ah battery, the RTU-3.7 is a direct replacement.
At 44 Ah it is a small size: the usual choice for petrol superminis and city cars with little equipment. The RTU-3.7 belongs to the Optima OPTIMA RED TOP range. More Optima batteries
Optima RTU-3.7 codes and part numbers
The RTU-3.7 is listed under these codes on labels, in garages and in catalogues:
| Commercial reference | RTU-3.7 |
|---|---|
| ETN code | 822255000 (also 822 255 000) |
| EAN | 4016987113561 |
| Case size according to Optima | 75/25 (BCI) |
| Base hold-down | B1 |
| Terminal type | 1 & 21 |
| Also known as | Optima 822255000 · Optima 822 255 000 |
| Not to be confused with | Optima RTR-3.7 (44 Ah, 730 A, positive terminal on the right) |
Optima RTU-3.7 vs RTC-4.2, RTR-3.7 and RTS-4.2: differences
How the RTU-3.7 compares with Optima batteries of similar size and capacity:
| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Optima RTU-3.7 (this one) | 44 Ah | 730 A | 237 × 172 × 197 | left | 15.7 kg |
| Optima RTC-4.2 | 50 Ah | 815 A | 254 × 175 × 200 | – | 18.5 kg |
| Optima RTR-3.7 | 44 Ah | 730 A | 237 × 172 × 197 | right | 15.6 kg |
| Optima RTS-4.2 | 50 Ah | 815 A | 254 × 175 × 200 | left | 18 kg |
- Optima RTC-4.2: 6 Ah more, 85 A more cranking power, a different case (254 × 175 × 200 mm).
- Optima RTR-3.7: identical to the RTU-3.7 except for the positive terminal, which is on the other side (positive terminal on the right).
- Optima RTS-4.2: 6 Ah more, 85 A more cranking power, a different case (254 × 175 × 200 mm).
Equivalents and alternatives to the Optima RTU-3.7
As the RTU-3.7 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 RTS-3.7 | Spiral AGM | 44 Ah | 730 A | 237 × 172 × 197 |
Inside the RTU-3.7: spiral AGM technology
The RTU-3.7 is a spiral-cell AGM battery. Perfect for 4x4s, marine use and vehicles with lots of electronics.
Check this before ordering the Optima RTU-3.7
- The RTU-3.7 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.
- The RTU-3.7 delivers 730 A cold cranking (EN standard); do not go below what your original battery states.
- With 44 Ah, the RTU-3.7 replaces an original battery of that capacity or slightly less.
- With the terminals facing you, the positive terminal of the RTU-3.7 is on the left.
- Measure the space: the RTU-3.7 takes up 237 × 172 × 197 mm.
Frequently asked questions about the Optima RTU-3.7
Optima RTU-3.7 or RTC-4.2?
Compared with the RTU-3.7, the Optima RTC-4.2 has 6 Ah more and 85 A more cranking power. If your current battery says 815 A or more, choose the RTC-4.2; if it says 730 A or less, the RTU-3.7 is enough. Mind the space: the RTC-4.2 measures 254 × 175 × 200 mm.
What is the difference between the Optima RTU-3.7 and the RTR-3.7?
They are the same battery with the terminals swapped: positive terminal on the left on the RTU-3.7, positive terminal on the right on the RTR-3.7. 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: 822 255 000 for the RTU-3.7 and 835 255 000 for the RTR-3.7.
What is the ETN code of the Optima RTU-3.7?
822255000, also written 822 255 000. The ETN (European Type Number) is printed on the label and used in parts catalogues.
Can the Optima RTU-3.7 be used in a car with Start-Stop?
Yes. As an AGM battery, the RTU-3.7 handles automatic engine stop and brake energy recovery, and it can replace an EFB of the same size.
How much does the Optima RTU-3.7 weigh?
The RTU-3.7 weighs 15.7 kg. For reference, the Optima RTC-4.2 (50 Ah) weighs 18.5 kg.
Which battery is equivalent to the Optima RTU-3.7?
Only other AGM batteries with its dimensions and polarity: Optima RTS-3.7. Neither an EFB nor a conventional battery replaces the RTU-3.7.
Which charger does the Optima RTU-3.7 need?
A charger with an AGM mode. If the battery has dropped below 10.5 V some chargers will not recognise it: use one with a recovery mode or one specific to spiral AGM.
Keep comparing: alternatives to the RTU-3.7
- More car batteries
- More Optima models
- Long WPX14-BS · 12 Ah, 151×88×147.5 mm
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