Monster Marine Lithium | SKU: 3640B

36V 40AH Bluetooth Deep Cycle Lithium Marine Trolling Battery MML-3640B

$899.00

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Returns

At Harbor Supply, we aim to ensure you’re completely satisfied with your purchase. If you need to return an item, you have 90 days from the date of delivery to initiate a return.

Eligibility for Returns:

To be eligible for a return:

The item must be in its original condition—unused, unworn, with all tags still attached, and in its original packaging.
You’ll need the receipt or proof of purchase.

Please note, returns must be authorized before sending any items back. Items returned without prior authorization will not be accepted.

Description

⚡ 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