Optima
Optima RTR-3.7 · Car battery 12V 44Ah 730A
Reference: BOL-OPTIMA-RTR-3.7 · EAN 4016987113578
Optima RTR-3.7 (ETN 835 255 000, also written 835255000): 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 right. If yours has the positive terminal on the left, you need the Optima RTS-3.7.
Optima RTR-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 right
Price:
€187.78
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VAT included. The exact shipping cost is shown in the cart before you pay.
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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 RTR-3.7 at a glance
The Optima RTR-3.7 is made for petrol and diesel cars without automatic engine stop. If your car has no Start-Stop and had a 44 Ah battery, the RTR-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 RTR-3.7 belongs to the Optima OPTIMA RED TOP range. More Optima batteries
Optima RTR-3.7 vs RTC-4.2, RTS-3.7 and RTR-4.2: differences
What sets the RTR-3.7 apart from its neighbours in the Optima range:
| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Optima RTR-3.7 (this one) | 44 Ah | 730 A | 237 × 172 × 197 | right | 15.6 kg |
| Optima RTC-4.2 | 50 Ah | 815 A | 254 × 175 × 200 | – | 18.5 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 RTC-4.2: 6 Ah more, 85 A more cranking power, a different case (254 × 175 × 200 mm).
- Optima RTS-3.7: identical to the RTR-3.7 except for the positive terminal, which is on the other side (positive terminal on the left).
- Optima RTR-4.2: 6 Ah more, 85 A more cranking power, a different case (254 × 175 × 200 mm).
Optima RTR-3.7 codes and part numbers
Shops, garages and catalogues identify the RTR-3.7 with these codes:
| Commercial reference | RTR-3.7 |
|---|---|
| ETN code | 835255000 (also 835 255 000) |
| EAN | 4016987113578 |
| Case size according to Optima | 35 (BCI) |
| Base hold-down | B3 |
| Also known as | Optima 835255000 · Optima 835 255 000 |
| Not to be confused with | Optima RTS-3.7 (44 Ah, 730 A, positive terminal on the left), Optima RTU-3.7 (44 Ah, 730 A, positive terminal on the left), Optima YTR-3.7 (48 Ah, 660 A) |
Equivalents and alternatives to the Optima RTR-3.7
No other reference in the catalogue fully matches the dimensions and polarity of the RTR-3.7; you will find the closest ones among our car batteries.
Before ordering the RTR-3.7, check this
- The RTR-3.7 needs 237 × 172 × 197 mm of space: measure it with the hold-down clamp in place.
- The RTR-3.7 has the positive terminal on the right: compare it with your current battery.
- Capacity of the RTR-3.7: 44 Ah; the same as your current battery or slightly more is fine.
- Check the EN amps on your battery: if it says 730 A or less, the RTR-3.7 covers your engine.
- The RTR-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.
Inside the RTR-3.7: spiral AGM technology
Inside, the RTR-3.7 rolls its plates into cylindrical cells (spiral AGM). It is the basis of OPTIMA batteries.
Frequently asked questions about the Optima RTR-3.7
Optima RTR-3.7 or RTC-4.2?
Compared with the RTR-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 RTR-3.7 is enough. Mind the space: the RTC-4.2 measures 254 × 175 × 200 mm.
What is the difference between the Optima RTR-3.7 and the RTS-3.7?
They are the same battery with the terminals swapped: positive terminal on the right on the RTR-3.7, positive terminal on the left on the RTS-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: 835 255 000 for the RTR-3.7 and 820 255 000 for the RTS-3.7.
What is the ETN code of the Optima RTR-3.7?
835255000, also written 835 255 000. The ETN (European Type Number) is printed on the label and used in parts catalogues.
Can the Optima RTR-3.7 be used in a car with Start-Stop?
Yes. As an AGM battery, the RTR-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 RTR-3.7 weigh?
The RTR-3.7 weighs 15.6 kg. For reference, the Optima RTC-4.2 (50 Ah) weighs 18.5 kg.
More batteries to compare with the RTR-3.7
- Other car batteries
- Full Optima catalogue
- Exide EK013 · 1.2 Ah, 18 A, 97×43×58 mm
- Long WPX14-BS · 12 Ah, 151×88×147.5 mm
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