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⚡ 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 |
