Optima
Optima BTDC-4.2 · Boat battery 12V 55Ah 765A
Reference: BOL-OPTIMA-BTDC-4.2 · EAN 4016987113547
Optima BTDC-4.2 (ETN 816 253 000, also written 816253000): boat battery with 12 V, 55 Ah and 765 A cold cranking current, measuring 254 × 175 × 200 mm, with the positive terminal on the left.
Optima BTDC-4.2 · Boat battery 12V 55Ah 765A images
- Voltage
- 12V
- Capacity
- 55Ah
- Cold cranking amps (EN)
- 765A
- Technology
- Spiral AGM
- Dimensions (L × W × H)
- 254 × 175 × 200 mm
- Polarity
- Positive terminal on the left
Price:
€212.24
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VAT included. The exact shipping cost is shown in the cart before you pay.
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For Spain, Portugal, France, Germany, Italy, Belgium and the Netherlands you see the exact cost before paying. For the rest of Europe we send you a shipping quote, with no obligation.
14 days to return your order
If it does not fit, you have 14 days from delivery to return it unused.
Who the Optima BTDC-4.2 is for
The Optima BTDC-4.2 is made for marine use. Check whether your boat needs starting, service or a dual-purpose battery before choosing.
The BTDC-4.2 belongs to the Optima OPTIMA BLUE TOP range. The full range of Optima batteries
Spiral AGM technology in the BTDC-4.2
Inside, the BTDC-4.2 rolls its plates into cylindrical cells (spiral AGM). It is the basis of OPTIMA batteries.
Optima BTDC-4.2 vs BTSLI-4.2 and BTDC-5.0
The real differences between the BTDC-4.2 and the closest Optima models:
| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Optima BTDC-4.2 (this one) | 55 Ah | 765 A | 254 × 175 × 200 | left | 20.6 kg |
| Optima BTSLI-4.2 | 50 Ah | 815 A | 254 × 175 × 200 | left | 18.4 kg |
| Optima BTDC-5.0 | 66 Ah | 765 A | 309 × 172 × 221 | left | 24.4 kg |
- Optima BTSLI-4.2: 5 Ah less, 50 A more cranking power, the same dimensions.
- Optima BTDC-5.0: 11 Ah more, the same cranking power, a different case (309 × 172 × 221 mm).
Equivalents and alternatives to the Optima BTDC-4.2
We have no other battery with exactly the dimensions and polarity of the BTDC-4.2. Browse the rest of our marine and boat batteries to compare close options.
Part numbers and codes for the Optima BTDC-4.2
This is how the Optima BTDC-4.2 appears on the label and in parts catalogues:
| Commercial reference | BTDC-4.2 |
|---|---|
| ETN code | 816253000 (also 816 253 000) |
| EAN | 4016987113547 |
| Case size according to Optima | 34 (BCI) |
| Base hold-down | B00 |
| Terminal type | 1 & 21 |
| Also known as | Optima 816253000 · Optima 816 253 000 |
What to look at before buying the BTDC-4.2
- Check the EN amps on your battery: if it says 765 A or less, the BTDC-4.2 covers your engine.
- Capacity of the BTDC-4.2: 55 Ah; the same as your current battery or slightly more is fine.
- Polarity of the BTDC-4.2: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Measure the space: the BTDC-4.2 takes up 254 × 175 × 200 mm.
Frequently asked questions about the Optima BTDC-4.2
BTDC-4.2 or BTSLI-4.2: which one suits me?
Compared with the BTDC-4.2, the Optima BTSLI-4.2 has 5 Ah less and 50 A more cranking power. If your current battery says 815 A or more, choose the BTSLI-4.2; if it says 765 A or less, the BTDC-4.2 is enough. Both measure 254 × 175 × 200 mm, so they fit the same tray.
What is the ETN code of the Optima BTDC-4.2?
816253000, also written 816 253 000. The ETN (European Type Number) is printed on the label and used in parts catalogues.
How much does the Optima BTDC-4.2 weigh?
20.6 kg, with 55 Ah of capacity. For reference, the Optima BTSLI-4.2 (50 Ah) weighs 18.4 kg.
Which side is the positive terminal on the Optima BTDC-4.2?
On the BTDC-4.2, the positive terminal is on the left with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.
Which charger does the Optima BTDC-4.2 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.
More batteries to compare with the BTDC-4.2
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