The MillerTech Complete Lithium Battery Bundle delivers a high-capacity power solution for fishing boats equipped with 36V trolling motors and demanding marine electronics. Featuring two 36V 60Ah Bluetooth lithium trolling motor batteries, a 12V 135Ah dual-purpose cranking battery, and a dual-voltage onboard charger, this package provides dedicated power for your trolling motor, outboard engine, and electronics.
With a combined 120Ah of 36V trolling motor capacity, the Complete Bundle is designed for anglers who spend long days on the water, fish in demanding conditions, or need additional battery reserve for extended trolling motor operation.
The included 12V 135Ah dual-purpose battery delivers 1,500 cold cranking amps and deep-cycle capacity for compatible outboard engines, fish finders, forward-facing sonar, and other onboard electronics.
Key Features
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Complete Marine Lithium Power Package: Includes trolling motor batteries, a dual-purpose cranking battery, and a dual-voltage onboard charger.
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120Ah Combined Trolling Motor Capacity: Two 36V 60Ah batteries provide 4,608Wh of total energy storage when connected in an approved parallel configuration.
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1,500 CCA Cranking Battery: The 12V 135Ah dual-purpose battery provides engine starting power and electronics capacity.
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Bluetooth Battery Monitoring: Monitor battery voltage, remaining capacity, and operating information through the MillerTech smartphone app.
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LiFePO4 Technology: Delivers consistent voltage, long cycle life, and reduced maintenance compared to traditional lead-acid batteries.
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Integrated Battery Management Systems: Provide protection against overcharging, excessive discharge, overcurrent, and temperature-related conditions.
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Low-Temperature Charging Protection: Helps protect the batteries from charging at unsafe temperatures.
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Marine-Grade Construction: IP65-rated battery cases designed for marine environments.
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10-Year Manufacturer Battery Warranty: MillerTech Sport Series batteries are backed by a 10-year manufacturer warranty.
What's Included
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(2) MillerTech 36V 60Ah Sport Series Bluetooth Lithium Trolling Motor Batteries – 3660-BT
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(1) MillerTech 12V 135Ah Bluetooth Dual-Purpose Cranking Battery – 12135-DP
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(1) MillerTech 12V/36V Dual Marine Lithium Battery Charger – 1215-3615
Battery Specifications
| Specification |
36V Trolling Batteries |
12V Cranking Battery |
| Model |
3660-BT |
12135-DP |
| Quantity |
2 |
1 |
| Battery Chemistry |
LiFePO4 |
LiFePO4 |
| Nominal Voltage |
38.4V Each |
12.8V |
| Individual Capacity |
60Ah Each |
135Ah |
| Combined Capacity |
120Ah in Parallel |
135Ah |
| Total Energy Storage |
4,608Wh |
1,728Wh |
| Cold Cranking Amps |
Not for Engine Starting |
1,500 CCA |
| Weight |
41.23 lbs. Each |
33 lbs. |
| Dimensions |
12.92" × 6.78" × 8.75" Each |
13" × 6.75" × 9" |
| Battery Group Size |
Group 31 |
Group 31 |
| Bluetooth Monitoring |
Yes |
Yes |
| Low-Temperature Charging Protection |
Yes |
Yes |
| Manufacturer Warranty |
10 Years |
10 Years |
Extended Runtime for 36V Trolling Motors
The MillerTech Complete Bundle features two 36V 60Ah lithium batteries designed to operate together in an approved parallel configuration.
This provides a combined 120Ah of capacity for compatible 36V trolling motor systems, making it a strong option for anglers who regularly fish in wind, current, or other demanding conditions.
Using two dedicated 36V batteries also eliminates the need for a traditional three-battery 12V series configuration.
Dedicated Cranking & Electronics Power
The included MillerTech 12V 135Ah dual-purpose battery provides both engine starting capability and deep-cycle power for onboard electronics.
Common applications include:
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Compatible marine outboard engines
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Garmin, Lowrance, and Humminbird fish finders
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Garmin LiveScope, Lowrance ActiveTarget, and Humminbird MEGA Live systems
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Marine GPS and networking equipment
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Other compatible 12V marine accessories
The 135Ah capacity provides a substantial energy reserve for modern electronics installations.
Dual-Voltage Onboard Charging
The included MillerTech 1215-3615 dual marine charger provides dedicated charging outputs for both battery systems.
| Charging Output |
Rating |
| 12V Battery Output |
14.5V / 15A |
| 36V Battery Output |
43.2V / 15A |
| Charger Protection Rating |
IP65 |
This allows the trolling motor battery bank and cranking battery to be recharged using one onboard charging system.
Compatibility & Installation
Before installation, verify your trolling motor's voltage and current requirements, your outboard manufacturer's lithium starting battery requirements, and the available space in your battery compartment.
The two 36V batteries must be connected according to MillerTech's approved parallel wiring instructions. The 12V cranking battery remains on its own electrical circuit.
Important: This package is intended for compatible 36V trolling motor systems and is not designed for 24V trolling motors.
Why Choose the MillerTech Complete Bundle?
The MillerTech Complete Bundle provides a comprehensive lithium battery upgrade for serious fishing boats. With 120Ah of combined 36V trolling motor capacity, a powerful 135Ah dual-purpose cranking battery, Bluetooth monitoring, and a matching onboard charger, this package delivers dependable power for long days on the water.
