Monster Marine Lithium | 1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion"
1500 CCA 300AH Dual Purpose Cranking Lithium – Bluetooth "Sea Lion"
Unmatched Power. Ultimate Reliability. Compact Size.
The Sea Lion is our most compact, energy-dense dual-purpose lithium battery ever. Designed for serious offshore and tournament anglers, it delivers an industry-leading 1500 Cold Cranking Amps (CCA) and an impressive 300Ah of capacity, making it a top-tier choice for starting your engine and powering your entire electronics setup—all from one battery.
Tested. Proven. Trusted.
A question we’re asked often is: “Will it work with my engine?”
The answer is yes—without a doubt.
We’ve personally tested this battery over years on boats owned by family, friends, and tournament pros. After over a year of real-world use, it has consistently delivered dependable performance across a wide range of engines, including:
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Mercury Pro XS 4-Stroke & 2-Stroke
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Yamaha 4-Stroke & SHO (both old and new models)
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Yamaha HPDI
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Mercury Verado 4-Stroke
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Suzuki 4-Stroke
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Evinrude 2-Stroke
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Mercruiser 4-Stroke
Built for Demanding Marine Systems
From high-draw electronics to cranking power-hungry outboards, the Sea Lion handles it all:
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1500 CCA for confident starts in any weather
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300Ah capacity for extended runtime
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Advanced BMS (Battery Management System) for safety, stability, and performance
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Bluetooth Monitoring via iOS & Android app for real-time status updates
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Grade A LiFePO4 Cells for maximum longevity and cycle life
Perfect For Power-Heavy Setups
Whether you're running:
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6 to 10 Graphs
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Mega 360
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Multiple Livescopes
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Shallow Water Anchors
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Bait Tanks
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Pumps
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Marine Lighting Systems
...this battery can handle all of it with ease.
Installation & Compatibility
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Group 31 case – Drop-in ready
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Plug-and-play wiring
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Connect up to 4 in series for 24V, 36V, or 48V systems
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Parallel capable for even more capacity
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Compatible with all AGM-mode chargers including:
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Minn Kota (Precision & Digital)
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Dual Pro
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NOCO
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Real Pro
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Pro Sport
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All chargers must have AGM charging capability.
Specification
Weight
56 lbs
CCA
1500 cold cranking amps
Size Dimensions
L 13.5 in (343mm) x W 7.25in (184mm) x H 9.75 in (247mm)
Voltage
12.8V
Energy
3840 Watts (Wh)
Amp-Hours
300Ah
Charge Volts
14.4-14.6v
Continuous Amps
300A max
Terminals
Top Post & M8
Are Solar Guys Pro Authorized Retailers?
Yes! We are proud to be one of the few online retailers who are authorized retailers for every single product we carry!
Being an authorized retailer means we carry the same warranty as the manufacturer, protecting your purchase!
When Will My Order Ship?
Most orders ship within 1–3 business days. You’ll get a tracking number as soon as it ships via email!
Do We Accept Returns?
Yes absolutely, we have a no-hassle, 30-day return policy on all items! To refer to the full policy, click HERE
Are Products Brand New?
Yes! By default, all products on Solar Guys Pro are 100% brand-new and in perfect condition.
If an item is used or refurbished, it will clearly indicate so in the title of the product as well as the discription.
For example, a used Battery will say:
XYZ Battery | 48V 100AH (REFURBISHED)
If you'd like to confirm, you can always send us a email at info@solarguyspro.com
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Frequently Asked Questions
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