Battery Optima Blue Top BTDC5.5 -12V 75Ah 975A

Ultimate power and maximum endurance for extreme marine environments.

The Optima BlueTop BT DC 5.5 is the flagship of the range. Classified under our Performance/High-End criteria, this 75Ah battery delivers a colossal 975A starting current. It's the obvious choice for boat owners whose batteries need to combine lightning-fast starting power with the deep cycle life required for onboard accessories.

Why choose the Optima BlueTop BT DC 5.5?

Patented SPIRALCELL® technology: Thanks to its spiral-wound pure lead plates, the Optima BT DC 5.5 offers a significantly larger exchange surface area than conventional batteries. This results in faster charging, increased runtime, and twice the lifespan.

Exceptional Starting Power: With 975A (EN), it effortlessly starts even the largest engines (high-powered inboard or outboard diesel), even after extended winter storage or in very humid conditions.

Dual Purpose: Unlike the SLI version, which is solely dedicated to starting, the DC (Deep Cycle) version is versatile. It handles both engine starting and powering your accessories (GPS, radar, refrigerator, bow thruster, windlass)

Resistance to Extreme Conditions: BlueTop units are completely watertight and hermetically sealed. They withstand the strongest vibrations and extreme temperatures and can be installed in almost any position.

Clean Installation: Equipped with dual terminals (standard European plugs + threaded terminals), it allows you to separate the power circuit from the service circuit for a reliable and corrosion-free electrical installation.

Investing in safety

Choosing the BT DC 5.5 ensures you always have the power reserve you need to leave the anchorage, even if you've been using your electrical accessories all day. Its low self-discharge guarantees a battery ready to use as soon as you take it out of winter storage.