Optima BLUETOP® D31M Marine Battery Marine Plumbing & Ventilation Advanced speed calibration allows for

Advanced speed calibration allows for calibration at multiple heel angles and speeds

lightweight coating that protects against abrasion

Built-in Garmin Quickdraw™ Contours mapping software lets you create and store maps with 1’ contours for up to 2 million acres

Versatile Pullover Neck Gaiter

Bypass diodes built into the junction box

Optima BLUETOP® D31M Marine Battery Marine Plumbing & Ventilation Advanced speed calibration allows forOPTIMA BLUETOP Marine Battery Dual purpose for both deep cycle and starting applications Maintenance free for maximum convenience Completely non spillable, mountable in many positions 15x the vibration resistance of a standard flooded battery Up to 3 times longer life vs. standard flooded batteries SPIRALCELL TECHNOLOGY with 99. 99% pure lead delivers more power and consistently outperforms conventional flat plate batteries