The MillerTech 12V 135Ah Bluetooth Lithium Dual Purpose Cranking Battery delivers powerful engine-starting performance and dependable reserve capacity for today's electronics-equipped fishing boats. With 1,500 cold cranking amps (CCA) and 135Ah of lithium power, this battery is designed to start compatible outboard engines while supporting fish finders, live sonar, pumps, and other onboard electronics.
Built with advanced LiFePO4 technology, the MillerTech Sport Series combines lightweight construction, Bluetooth monitoring, and reliable deep-cycle performance in a single Group 31 battery.
Key Features
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1,500 Cold Cranking Amps: Provides powerful starting performance for compatible marine outboard engines.
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135Ah Lithium Capacity: Supplies extended reserve power for fish finders, live sonar, and other onboard electronics.
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Dual Purpose Design: Combines engine cranking and deep-cycle electronics power in one battery.
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Bluetooth Monitoring: Connect to the MillerTech app to monitor battery status and performance from your smartphone.
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Lightweight Construction: Weighs just 33 lbs., significantly less than many traditional lead-acid marine batteries.
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Built-In Battery Management System (BMS): Protects against overcharging, over-discharging, excessive current, and unsafe temperatures.
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Low-Temperature Charging Protection: Helps prevent charging damage in cold conditions.
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Marine-Grade Housing: IP65-rated case with a heavy-duty gasket and stainless steel breather vent.
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10-Year Manufacturer Warranty: Backed by MillerTech's Sport Series warranty.
Specifications
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Manufacturer: MillerTech
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Part Number: 12135-DP
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Battery Type: LiFePO4 Lithium Dual Purpose
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Nominal Voltage: 12.8V
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Capacity: 135Ah
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Energy Storage: 1,728Wh
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Cold Cranking Amps: 1,500 CCA
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Maximum Charge/Discharge Current: 135A
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Maximum Charging Voltage: 14.6V
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Weight: 33 lbs.
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Dimensions: 13" L × 6.75" W × 9" H
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Group Size: 31
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Terminals: M8
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Bluetooth: Yes
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Battery Management System: Integrated BMS
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Warranty: 10 Years
Marine Engine & Electronics Applications
The MillerTech 12V 135Ah dual purpose battery is designed for marine applications requiring both engine-starting power and dependable electronics runtime.
Ideal applications include:
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Starting compatible marine outboard engines
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Powering Garmin, Lowrance, and Humminbird fish finders
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Supporting Garmin LiveScope, Lowrance ActiveTarget, and Humminbird MEGA Live systems
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Running onboard pumps, lighting, and other 12V accessories
Always verify your outboard manufacturer's lithium battery requirements and charging system compatibility before installation.
Why Choose MillerTech Lithium?
Modern fishing boats often run multiple large fish finders, live sonar systems, and other electronics that place significant demands on traditional cranking batteries.
The MillerTech 135Ah dual purpose battery provides a lightweight lithium solution with the starting power needed for compatible outboards and the reserve capacity to support demanding electronics setups.
With Bluetooth monitoring, a compact Group 31 footprint, and a 10-year manufacturer warranty, it's an excellent upgrade for anglers looking for dependable marine power.
