The MillerTech 12V 135Ah Heated Bluetooth Lithium Dual Purpose Battery delivers powerful engine starting performance and dependable deep-cycle capacity in one marine battery. Featuring 1,500 cold cranking amps (CCA), 135Ah of lithium capacity, and built-in Bluetooth monitoring, this battery is designed for anglers who need reliable cranking power and extended electronics runtime.
The heated version adds an integrated heating system for cold-weather charging, making it an excellent choice for anglers who fish during early spring and late fall. Its Group 31 design combines high starting power with the reserve capacity needed to run multiple fish finders, forward-facing sonar systems, and other onboard electronics.
Key Features
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Dual Purpose Marine Battery: Combines engine starting power and deep-cycle electronics capacity in one battery.
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1,500 Cold Cranking Amps: Delivers high starting power for compatible marine outboard engines.
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135Ah Lithium Capacity: Provides 1,728Wh of stored energy for fish finders, GPS, live sonar, and other 12V electronics.
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Integrated Battery Heater: Activates when connected to a charger and battery temperature drops below 32°F, helping protect the battery during cold-weather charging.
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Built-In Bluetooth Monitoring: Monitor battery status and performance through the MillerTech smartphone app.
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Lightweight Group 31 Design: Weighs approximately 33 lbs., reducing weight compared to many traditional lead-acid cranking batteries.
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Advanced Battery Management System: Provides protection against overcharging, overdischarging, excessive current, and unsafe temperatures.
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Marine-Grade Construction: Heavy-duty battery case with secure hold-down grooves, M8 terminals, and a sealed lid.
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10-Year Manufacturer Warranty: Backed by MillerTech's lithium battery warranty.
Specifications
| Specification |
Details |
| Manufacturer |
MillerTech |
| Part Number |
12135-DPH |
| Battery Type |
Heated Dual Purpose Cranking Battery |
| Chemistry |
LiFePO4 Lithium |
| Nominal Voltage |
12.8V |
| Capacity |
135Ah |
| Energy Storage |
1,728Wh |
| Cold Cranking Amps |
1,500 CCA |
| Battery Group Size |
Group 31 |
| Weight |
33 lbs. |
| Dimensions |
13" L × 6.75" W × 9" H |
| Terminals |
M8 |
| Maximum Charging Voltage |
14.6V |
| Maximum Charge/Discharge Current |
135A |
| Bluetooth Monitoring |
Yes |
| Integrated Heating |
Yes |
| Manufacturer Warranty |
10 Years |
Built-In Heating for Cold-Weather Charging
The integrated heating system helps protect the battery when charging in cold temperatures.
When connected to a charger and the internal battery temperature drops below 32°F, the heating system activates to warm the battery before normal charging resumes.
This makes the heated model particularly useful for anglers who regularly fish in colder climates.
Dual Purpose Cranking & Electronics Power
The MillerTech 12135-DPH is designed for compatible marine applications requiring both starting power and deep-cycle capacity.
Common applications include:
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Compatible 12V outboard engine starting systems
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Garmin, Lowrance, and Humminbird fish finders
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Forward-facing sonar systems
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Marine GPS and networking equipment
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Other compatible 12V onboard electronics
The combination of 1,500 CCA and 135Ah capacity makes this battery a practical choice for boats with multiple electronics and significant power demands.
Charging & Compatibility
Use a compatible 12V LiFePO4 charger or an approved marine charging system.
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Maximum charging voltage: 14.6V
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Integrated heating for cold-weather charging
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Built-in battery management protection
Important: Verify your outboard manufacturer's lithium battery requirements, minimum CCA specifications, and alternator compatibility before installation.
Why Choose MillerTech?
MillerTech dual purpose lithium batteries provide a combination of cranking performance, deep-cycle capacity, and lightweight construction. With integrated heating, Bluetooth monitoring, and a 10-year manufacturer warranty, the 12135-DPH is a dependable option for upgrading a compatible marine electrical system.
