1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living

1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion"

Authorized Monster Marine Lithium Dealer | Full Vendor Warranty Included

Customers rate us 4.6/5 based on 413 reviews.
$2,399.00
$2,399.00
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1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living

Monster Marine Lithium

1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion"

$2,399.00
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living
1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion" - Green Vista Living

Monster Marine Lithium

1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion"

$2,399.00
  • Description
  • Why Buy From Us

Monster Marine Lithium “Sea Lion”

1500CCA • 300Ah Dual Purpose Bluetooth Cranking Lithium Battery

Model: MML-15300JB

Overview

Introducing The Sea Lion — the ultimate combination of strength, endurance, and intelligent power management.
Engineered for anglers, captains, and offshore professionals who demand all-day performance, this 1500CCA 300Ah Dual Purpose Bluetooth Cranking Lithium Battery delivers unmatched capacity and starting reliability in a surprisingly compact design.

With 1500 cold cranking amps and an incredible 300 amp-hours of energy, The Sea Lion offers multi-day runtime without recharging — making it the ideal solution for high-demand systems with multiple graphs, sonar units, bait tanks, pumps, and lighting setups.

Built to meet and exceed Mercury Marine’s newest specification bulletin, this battery has been extensively tested for years across the industry’s top engines:

  • Mercury Pro XS 4-Stroke

  • Yamaha SHO & 4-Stroke (new and legacy)

  • Yamaha HPDI

  • Mercury Verado 4-Stroke

  • Suzuki 4-Stroke

  • Evinrude 2-Stroke

  • Mercury Pro XS 2-Stroke

  • MerCruiser 4-Stroke

At just 56 lbs, this battery combines huge energy density with modern efficiency — a perfect fit for serious freshwater and offshore applications alike.

Key Features

⚙️ Dual Purpose Design
Built for both engine cranking and deep-cycle operation, giving you powerful starts and hours of sustained energy for demanding setups.

⚡ Massive Power Output
Delivers 1500 cold cranking amps (CCA) — enough to start even the toughest high-output 4-stroke motors with ease.

🔋 Exceptional Deep-Cycle Capacity
Features 300Ah of energy storage — easily running multiple sonar systems, Livescopes, shallow water anchors, bait tanks, and more.

📱 Bluetooth Smart Monitoring
Monitor voltage, charge levels, and real-time performance through the MMLithium Bluetooth App on your smartphone.

🧠 Advanced BMS System
Built with our most sophisticated Battery Management System (BMS) yet — ensuring stability, protection, and high current tolerance for marine environments.

🧭 Compact Power Density
Despite its massive output, The Sea Lion maintains a compact footprint, fitting into standard Group 31–sized compartments.

🪛 Grade A LiFePO₄ Cells
Constructed using only premium-grade lithium cells for unmatched safety, reliability, and long-term performance.

⚙️ Specifications

Category Details
Weight 56 lbs
Cold Cranking Amps (CCA) 1500
Dimensions (L × W × H) 13.5 in × 7.25 in × 9.75 in (343 × 184 × 247 mm)
Nominal Voltage 12.8 V
Nominal Capacity 300 Ah
Energy 3840 Wh
Charge Voltage Range 14.4 – 14.6 V
Continuous Discharge Current 300 A max
Terminal Type Top Post & M8 Bolt Combo
Battery Chemistry Lithium Iron Phosphate (LiFePO₄)
Cycle Life 4000+ cycles
Bluetooth Functionality Built-in Smart Monitoring via MMLithium Bluetooth App

⚓ Applications

Use Case Compatibility
Primary Use Cranking and deep-cycle marine applications
Suitable Engines 2-Stroke & 4-Stroke outboards (Mercury, Yamaha, Suzuki, Evinrude, etc.)
Electronics Support 6–10 graphs, Mega 360, 1–2 Livescopes, shallow-water anchors, bait tanks, pumps, and lighting systems
Replacement For 12V AGM or lead-acid batteries
Mounting Compact footprint fits Group 34 

Why Choose Green Vista Living


At Green Vista Living, we’re passionate about providing top-quality renewable energy and eco-friendly products that not only enhance your life but also help protect the planet. We’ve built our business with one mission in mind: to be the go-to destination for renewable energy solutions, outdoor gear, and off-grid supplies. When you shop with us, you’re not just getting innovative products—you’re joining a community that’s committed to sustainability.

We Put Our Customers First


As a small, dedicated team, we care deeply about your experience. Unlike large, faceless online companies, Green Vista Living offers a personal touch in everything we do. We're here for you from start to finish—whether you need product advice, support after a purchase, or just have questions. Our knowledgeable customer service team is always just a phone call or email away, ready to assist you in any way possible.

We Share Your Passion for the Planet


Our love for the outdoors and sustainable living runs deep. Most of our team hails from the mountains of Colorado, where renewable energy and the environment are part of daily life. So when you call Green Vista Living, you’ll speak directly with an expert who understands both the technical side of renewable products and the lifestyle they support. Whether you’re looking for solar generators, EV chargers, or any of our eco-friendly offerings, you can trust us to guide you with expertise and passion.

Trusted Industry Experts


Our close partnerships with the best brands in renewable energy and outdoor gear give us insider knowledge that you won’t find anywhere else. We’ve taken the time to carefully select products that stand out for their quality and reliability. At Green Vista Living, we believe in understanding our products inside and out so that we can help you make the right choice with confidence.

More Reasons to Love Green Vista Living


Price Match Guarantee: Thanks to our partnerships, we offer the best prices around. If you find a better deal, we’ll refund the difference.


Free Shipping: We offer free shipping on most orders to the lower 48 U.S. states, making your shopping experience even easier.


100% Secure Ordering: Our site uses SSL Encryption technology to keep your payment and personal information safe and secure.


Volume Discounts: For large orders, we’re happy to provide special pricing—just reach out for a custom quote.


Authorized Dealer: As an authorized dealer for all our brands, you’ll receive full manufacturer warranties with every order.


At Green Vista Living, we aim to make your renewable energy and outdoor experience as seamless and enjoyable as possible. With our unmatched customer service, expertise, and dedication to quality, you can shop with confidence, knowing you’re supporting a company that’s as committed to the planet as you are.

Frequently Asked Questions

Yes! We provide free and fast shipping on MOST orders within the continental United States. However, some specific brands and items will require a quote. You can live chat or call us for a quote
Most orders ship out within 1–2 business days and arrive within 3–5 business days depending on your location.
We offer easy returns as long as your item meets the conditions outlined in our Return Policy. Items must be unused, in original packaging, and returned within the specified return window.
Absolutely! Our in-house product experts are here to help. Live chat or call us 513-743-829 for personalized advice before or after your purchase.
Yes. All products include any applicable manufacturer warranties, and we’ll help you handle any warranty claims if needed.
Yes, we only sell 100% authentic, brand-new products, sourced directly from our manufacturers or authorized distributors.

Over 2,000+ Online Orders

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Feedback From Our Customers

At Green Vista Living, we pride ourselves on delivering top-quality products and exceptional service to solar professionals and homeowners alike. Here's what our customers have to say about their experiences with us.

Kevin Leary
May 18, 2025
★★★★★

Incredible Tech Support from Anees of Green Vista Living. Exceptional service and went above and beyond on every question.

Bryan Cunningham
Off grid Kit • Dec 21, 2025
★★★★★

Shipment was slow due to high demand, but the team kept me informed and ensured everything arrived properly.

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