36V 40AH Bluetooth Deep Cycle Lithium Marine Trolling Battery MML-3640B
⚡ Monster Marine Lithium™ MML-CW3640B “Ironhorse”
36V 40Ah Bluetooth Deep Cycle Marine Trolling Battery
Overview
Meet The Ironhorse — built for those who demand reliable power in a compact, ultra-light design.
This 36V 40Ah Bluetooth Lithium Battery delivers steady, efficient energy for your trolling motor while keeping your setup light and streamlined.
At just 33 lbs, The Ironhorse weighs nearly 60% less than a single SLA battery, freeing up valuable space and improving boat balance.
With advanced Lithium Iron Phosphate (LiFePO₄) technology, it provides consistent power output, longer life, and faster recharge times — ensuring peak performance, every trip.
Key Features
✅ One Battery, Triple the Output
Replaces three 12V batteries — saving space, simplifying wiring, and reducing overall boat weight.
📱 Integrated Bluetooth Monitoring
Track real-time voltage, current, capacity, and battery health directly from your smartphone via the MMLithium app.
⚡ Lightweight, Heavy-Duty Power
Power that weighs less — dramatically lighter than lead-acid with more muscle in every amp.
🔋 LiFePO₄ Technology
Provides double the usable power, four times the cycle life, and consistent voltage output from start to finish.
➕ Expandable Power
Easily connect a second in parallel (positive to positive, negative to negative) to double capacity.
🪛 Plug-and-Play Installation
Connect your trolling motor directly to the battery — no complex setup required.
⚙️ Specifications
| Category | Details |
|---|---|
| Weight | 33 lbs (14.9 kg) |
| Dimensions (L × W × H) | 13 in × 6.77 in × 8.66 in (330 × 172 × 220 mm) |
| Nominal Voltage | 38.4 V |
| Nominal Capacity | 40 Ah |
| Energy | 1536 Wh |
| Charge Voltage Range | 43.8 V |
| Max Charge Current | 40 A |
| Continuous Discharge Current | 100 A max |
| Terminal Type | M8 Brass Bolt |
| Battery Chemistry | Lithium Iron Phosphate (LiFePO₄) |
| Cycle Life | 4000+ cycles |
| Bluetooth Functionality | Built-in Smart Monitoring via App |
⚓ Applications
| Use Case | Compatibility |
|---|---|
| Primary Use | 36 V trolling motors |
| Parallel Configuration | Connect Multiple in parallel for extended run time. |
| Replacement For | (3) × 12 V SLA batteries |
| Compatible Brands | Minn Kota • Garmin • Lowrance • Rhodan • All 36 V trolling motors |
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 36V 40AH Bluetooth Deep Cycle Lithium Marine Trolling Battery MML-3640B.
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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.
