12v 50Ah Deep Cycle Lithium Marine Battery "Hyena" - MML-CW1250
⚡ Monster Marine Lithium™ “Hyena”
12V • 50Ah Portable Bluetooth Deep Cycle Lithium Battery
Model: MML-CW1250B
Overview
Lightweight, portable, and powerful — meet The Hyena, your go-anywhere 12V power solution.
Designed for kayaks, small boats, go-boats and mobile power setups, this compact lithium battery weighs only 14 lbs, offering exceptional portability without sacrificing performance.
Built with advanced Lithium Iron Phosphate (LiFePO₄) technology, The Hyena delivers twice the power, a fraction of the weight, and four times the lifespan of traditional lead-acid batteries.
It’s the perfect fit for anglers, adventurers, and outdoor enthusiasts who need dependable power for their electronics, trolling motors, or portable setups.
With Bluetooth connectivity through the MMLithium App (iOS & Android), monitoring your battery’s status has never been easier.
Installation is simple — true plug-and-play operation — and you can wire up to four batteries in series for 24V, 36V, or 48V systems.
Key Features
⚙️ Ultra-Lightweight Design
At only 14 lbs, The Hyena provides incredible power-to-weight efficiency — ideal for kayaks, small vessels, or portable power boxes.
🔋 Reliable Deep-Cycle Power
Delivers 50Ah of steady power at 12.8V — perfect for fish finders, sonar units, and other sensitive electronics.
📱 Bluetooth Smart Monitoring
Monitor charge level, voltage, and performance directly from your phone with the MMLithium Bluetooth App.
🧠 Advanced LiFePO₄ Technology
Safe, stable, and long-lasting — with over 4000 charge cycles and consistent voltage under load.
🔌 Plug-and-Play Installation
Easy setup — connect your power leads, and you’re ready to go. Wire in series or parallel for expanded setups.
⚡ Charger Compatibility
Compatible with AGM marine chargers (use AGM setting):
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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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ProSport
⚙️ Specifications
| Category | Details |
|---|---|
| Weight | 14 lbs |
| Dimensions (L × W × H) | 7.5 in × 5 in × 6.5 in (195 × 130 × 154 mm) |
| Nominal Voltage | 12.8 V |
| Nominal Capacity | 50 Ah |
| Energy | 640 Wh |
| Charge Voltage Range | 14.6 V |
| Max Charge Current | 50 A |
| Continuous Discharge Current | 60 A max |
| Battery Chemistry | Lithium Iron Phosphate (LiFePO₄) |
| Cycle Life | 4000+ cycles |
| Terminal Type | M8 Bolt |
| Configuration Options | Up to 4 in series for 48V max / parallel for more capacity |
| Bluetooth Functionality | Built-in Smart Monitoring via MMLithium App |
⚓ Applications
| Use Case | Compatibility |
|---|---|
| Primary Use | Portable power for 12V electronics, kayaks, and small trolling motors |
| Voltage Systems | Compatible with 12V, 24V, 36V, and 48V configurations |
| Suitable Motors | Minn Kota, Garmin, Lowrance, Rhodan, and similar |
| Other Uses | Fish finders, lighting, portable power boxes, camping, and outdoor setups |
| Replacement For | 12V AGM or lead-acid batteries |
| Weight Advantage | Approximately 70% lighter than standard batteries |
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 12v 50Ah Deep Cycle Lithium Marine Battery "Hyena" - MML-CW1250.
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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.
