1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion"
⚡ 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:
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Mercury Pro XS 4-Stroke
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Yamaha SHO & 4-Stroke (new and legacy)
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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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Mercury Pro XS 2-Stroke
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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 |
Frequently Asked Questions
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Yes, Festive Water Paddlesports is an authorized Monster Marine Lithium dealer. We carry a wide selection of Monster Marine Lithium products online and in store!
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All products at Festive Water Paddlesports are subject to their specific manufacturer's warranty policy.
Please refer to the Monster Marine Lithium website for more warranty information about the 1500 CCA 300AH Dual Purpose Cranking Lithium Bluetooth "Sea Lion".
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Yes, Festive Water provides outfitting and rigging services!
If you have a whitewater kayak or touring, we can modify and update your outfitting.
For fishing kayaks, we can install motors, fish finders, lights, and other electronics.
Check out our Kayak Rigging page for more information.
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Yes, we offer full and partial refunds. However, some products like kayaks, SUPs, and other watercraft are excluded (sales are final).
Please read our Refund policy for more information.
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Festive Water Paddlesports offers financing through Affirm. Add your items to the cart, check out, and select Affirm as your payment method.
Check out our Financing page to learn more about Financing.
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At Festive Water, to thank you for your service, we've partnered with GovX to offer a 10% discount on our store.
You can learn more by checking out our Military and Public Service page. -
Yes, Festive Water Paddlesports ships kayaks across the lower 48 U.S. states with white glove, premium shipping!
Shipping rates are calculated at checkout.
Learn more by checking out our Shipping Policy page.
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We use USPS and UPS for small packages, and private courier partners for kayak shipping. Use the shipping estimator in the checkout to check your shipping rates.
For more information, please check out our Shipping Policy.
