Optima
Optima RTS-3.7 · Car battery 12V 44Ah 730A
Reference: BOL-OPTIMA-RTS-3.7 · EAN 4016987113554
The Optima RTS-3.7 (ETN 820 255 000, also written 820255000) 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 RTS-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:
€186.71
Tax included
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.
Who the Optima RTS-3.7 is for
The Optima RTS-3.7 is made for petrol and diesel cars without automatic engine stop. Its job is to start the engine in the cold with margin to spare and keep the car's electronics powered.
At 44 Ah it is a small size: the usual choice for petrol superminis and city cars with little equipment. The RTS-3.7 belongs to the Optima OPTIMA RED TOP range. More Optima batteries
Part numbers and codes for the Optima RTS-3.7
This is how the Optima RTS-3.7 appears on the label and in parts catalogues:
| Commercial reference | RTS-3.7 |
|---|---|
| ETN code | 820255000 (also 820 255 000) |
| EAN | 4016987113554 |
| Case size according to Optima | 25 (BCI) |
| Base hold-down | B1 |
| Also known as | Optima 820255000 · Optima 820 255 000 |
| Not to be confused with | Optima RTR-3.7 (44 Ah, 730 A, positive terminal on the right) |
Optima RTS-3.7 vs RTC-4.2, RTR-3.7 and RTS-4.2
How the RTS-3.7 compares with Optima batteries of similar size and capacity:
| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Optima RTS-3.7 (this one) | 44 Ah | 730 A | 237 × 172 × 197 | left | 15.6 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).
- The Optima RTR-3.7 is the same battery with the positive terminal on the other side: choose it if your current battery has the 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 RTS-3.7
Other AGM batteries that fit the RTS-3.7's tray with the same polarity: an AGM can only be replaced by another AGM.
| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Optima RTU-3.7 | Spiral AGM | 44 Ah | 730 A | 237 × 172 × 197 |
What it means that the RTS-3.7 is spiral AGM
Inside, the RTS-3.7 rolls its plates into cylindrical cells (spiral AGM). It is the basis of OPTIMA batteries.
Check this before ordering the Optima RTS-3.7
- The RTS-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 RTS-3.7 delivers 730 A cold cranking (EN standard); do not go below what your original battery states.
- With 44 Ah, the RTS-3.7 replaces an original battery of that capacity or slightly less.
- Polarity of the RTS-3.7: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Measure the space: the RTS-3.7 takes up 237 × 172 × 197 mm.
Frequently asked questions about the Optima RTS-3.7
RTS-3.7 or RTC-4.2: which one suits me?
Compared with the RTS-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 RTS-3.7 is enough. Mind the space: the RTC-4.2 measures 254 × 175 × 200 mm.
Optima RTS-3.7 or RTR-3.7: what is the difference?
Only the polarity: the RTS-3.7 has the positive terminal on the left and the RTR-3.7 the positive terminal on the right. Capacity (44 Ah), cranking power and dimensions are identical. That is why their ETNs only differ in the middle group: 820 255 000 for the RTS-3.7 and 835 255 000 for the RTR-3.7.
What is the ETN code of the Optima RTS-3.7?
820255000, also written 820 255 000. The ETN (European Type Number) is printed on the label and used in parts catalogues.
Can the Optima RTS-3.7 be used in a car with Start-Stop?
Yes. As an AGM battery, the RTS-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 RTS-3.7 weigh?
15.6 kg, with 44 Ah of capacity. For reference, the Optima RTC-4.2 (50 Ah) weighs 18.5 kg.
Which battery is equivalent to the Optima RTS-3.7?
Only other AGM batteries with its dimensions and polarity: Optima RTU-3.7. Neither an EFB nor a conventional battery replaces the RTS-3.7.
More batteries to compare with the RTS-3.7
- More car batteries
- More Optima models
- 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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