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On the water, what takes you out has to bring you back. The OPTIMA® BLUETOP® battery delivers the power you can rely on. Its patented SPIRALCELL TECHNOLOGY®means more running time, faster recharge, and up to twice the life of traditional marine batteries. And it’s specifically built to handle the demanding challenges of marine applications.

The OPTIMA® BLUETOP battery is completely spill-proof and maintenance-free. It’s lightweight and can be mounted virtually anywhere and in any position. It’s over 15 times more resistant to vibration than other batteries, which matters in the hull of a boat. And it retains its charge longer and recharges faster thanks to its remarkably low self-discharge rate. And that can mean a quicker return to the water after the off-season.


  • Starting and dual-purpose (starting and deep-cycling) models available
  • Lasts up to 3 times longer than other batteries
  • More power in the initial 1, 2, 5 and 10 seconds of the starting process than comparably rated conventional lead-acid batteries
  • 15 times more resistant to vibration than other batteries
  • Nonspillable with complete fitment flexibility; can mount in almost any position
Product Voltage (V) Capacity (Ah) Dimension (mm) Weight (kg) Terminal
20Hr L W H
BT DC 4.2 12 55 254.0 175.0 200.0 19.7 Dual SAE 5/16 Stainless Stud
BT DC 5.0 12 66 309.0 172.0 221.0 24.4 Dual SAE 5/16 Stainless Stud
BT DC 5.5 12 75 325.0 165.0 238.0 26.5 Dual SAE 5/16 Stainless Stud
BT SLI 4.2 12 50 254.0 175.0 200.0 17.4 Dual SAE 5/16 Stainless Stud
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