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Optima Blue Top Marine Battery - 8016-253 12V 55Ah - BTDCM4.2, 2 Years Warranty
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CCL 15-009 Brass Positive Battery Terminal M8 Stud
Total Price: £238.23 ADD ALL two TO CART
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Technical Specification
PRODUCT NUMBER EM1000EP450EP500LSLC50-12LSLC55-12
Voltage 1212121212
Capacity (AH) 5050605055
Cold Cranking Amps (EN1) 800750680
Terminal Type F8F8
Length 260260242197229
Width 173173175165138
Height 206206190170214
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Q 1. What is the voltage and capacity of the Optima Blue Top BTDCM4.2?

A. The BTDCM4.2 (8016-253) is a 12V battery with a rated capacity of 55Ah at the C20 discharge rate and a Cold Cranking Amp (CCA EN) rating of 765A.

Q 2. What does AGM construction mean and why does it matter for marine use?

A. AGM stands for Absorbent Glass Mat. The electrolyte is held within fibreglass mat separators rather than remaining as free liquid, making the battery spill-proof and maintenance-free. For marine applications this construction also provides superior resistance to vibration, shock, and the risk of acid spillage in a vessel environment.

Q 3. What terminal configuration does the BTDCM4.2 use?

A. This battery is fitted with a Dual Terminal (DT) arrangement, which provides both SAE post terminals and threaded stud terminals, allowing flexible cable connection options for marine and RV installations.

Q 4. What is the polarity layout of the BTDCM4.2?

A. The polarity code is 1, which denotes Positive terminal on the Right when the battery is viewed from the front with the terminals facing towards you. Confirm this orientation is compatible with your vehicle or vessel wiring before installation.

Q 5. Is the Optima Blue Top BTDCM4.2 suitable for use with trolling motors?

A. Yes. The Blue Top range is specifically designed for dual-purpose marine use, providing both engine-starting cranking power and the sustained deep-cycle discharge capability required to run trolling motors and onboard electronics over extended periods.

Q 6. Can the BTDCM4.2 be used in a start-stop vehicle application?

A. The AGM technology used in this battery is fundamentally compatible with start-stop system requirements. However, suitability for a specific vehicle must be verified against the product label and your vehicle manufacturer's specification, as not all start-stop systems are identical in their demands.

Q 7. Are there any cross-reference part numbers for the BTDCM4.2?

A. No cross-reference codes are currently held on file for this product. To identify a suitable replacement for an existing battery, match the voltage (12V), capacity (55Ah), CCA rating (765A EN), and physical dimensions against your current battery specification.

Q 8. What warranty is provided with the Optima Blue Top BTDCM4.2?

A. The BTDCM4.2 is covered by a 2-year manufacturer warranty against defects in materials and workmanship from the date of purchase.

Q 9. What are the delivery terms for the BTDCM4.2 at PartsForMachines?

A. Standard delivery is 1–3 working days within UK mainland. A 30-day returns policy applies. For full delivery and returns information, please refer to our delivery and returns pages at the time of ordering.

Q 10. What are the physical dimensions and weight of the BTDCM4.2?

A. The battery measures 254mm (length) × 175mm (width) × 200mm (height including terminal) and weighs 20.6kg. Always verify that your battery tray or compartment can accommodate these dimensions before ordering.

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