The Monster Marine Lithium 12V 300Ah 1500CCA Sea Lion Battery is the ultimate dual-purpose solution for cranking and powering even the most demanding setups. Built to exceed Mercury's engine specifications, it has been extensively tested on Mercury Pro XS, Yamaha 4-Stroke, Suzuki, and other major engines with proven reliability. Offering an incredible 1500 Cold Cranking Amps (CCA) and 300Ah of capacity, this compact, energy-dense lithium battery is perfect for multi-day runs or large offshore boats with heavy electronics, bait tanks, and pumps. Equipped with an Advanced BMS system and Bluetooth monitoring, it ensures peak performance, durability, and easy monitoring through your smartphone. From powering 6-10 graphs, Mega 360, Livescopes, shallow water anchors, to all your lights and pumps, the Sea Lion can handle it all.

SPECIFICATIONS

WARRANTY

WEIGHT

56 lbs

SIZE

13.5″ (L) x 7.25” (W) x 9.75” (H

STORAGE CAPACITY

300 ampere hours (Ah). Monster Marine Lithium batteries deliver reliable, consistent power throughout the full 300Ah capacity. Unlike traditional SLA batteries, Monster Marine Lithium LiFePO4 batteries feature a flat voltage curve, ensuring steady power output as they discharge. This advanced design provides uniform performance, giving you dependable energy all the way to the last drop.

Engine Starting Power

Lithium battery equivalent to 1,500 Cold Cranking Amps (CCA) of lead acid battery engine starting power. Suitable for automotive and other applications. Marine Outboards: Please refer to your manufacturer recommendations.

Bluetooth Capable

Yes

VOLTAGE

12.8V 

ENERGY

3840 Wh

TERMINALS

Top Post & M8

LIFECYCLES (BATTERY LIFESPAN)

Retains up to 80% capacity for 5,000 cycles under recommended conditions—far surpassing the 500 cycles of typical SLA batteries. Monster Marine Lithium batteries deliver exceptional longevity, reducing the cost per use to a fraction of traditional battery options.

OPERATING TEMPERATURE

Built for rugged and extreme conditions, Monster Marine Lithium batteries outperform SLA and other lithium options. With an optimal operating range from -20°F to +140°F and reliable performance down to -20°F, these batteries are designed to thrive in tough environments. Note: For best results, avoid charging below 32°F

DISCHARGE

300A max continuous discharge, 1500 A max pulse. The flat discharge voltage curve provides a 75% bigger capacity then a SLA 50Ah battery.

CHARGE

100a max, 14.4V recommended, 15V max Please note: this battery should be charged using a LiFePO4 compatible charger. A SLA charger may work, but will reduce performance and lifespan of the battery.

INCLUDES ACTIVE BMS PROTECTION

Equipped with an advanced circuit, this battery ensures cell balancing, low and high voltage cutoff, short circuit protection, and high-temperature protection. These features boost performance and significantly extend the battery's lifespan.

Unlock the Monster Marine Lithium Advantage

The Monster Marine Lithium 12V 300Ah 1500CCA Sea Lion Battery delivers unmatched cranking power and capacity, ideal for offshore boats and demanding marine setups.

USD : 96.59