Millertech Marine Lithium Batteries
What Makes it a Marine Battery?
Built for anglers who demand reliability in every condition, Millertech Marine Lithium Batteries are engineered from the inside out to withstand the challenges of life on the water. From rugged case construction and advanced battery protection to smart monitoring technology and marine-focused design details, every battery is crafted to deliver dependable power, long-lasting performance, and confidence when you’re miles from the dock. Whether you’re powering electronics, trolling motors, or starting your engine, Millertech marine-grade LiFePO4 lithium batteries deliver superior cycle life and reliability compared to traditional lead-acid batteries.
RUBBER GASKET
All Millertech Marine batteries are sealed with a RUBBER GASKET to ensure no water gets inside!
STAINLESS-STEEL BREATHER VENT
Our custom molded, heavy duty, reclosable battery case has a marine-grade, STAINLESS-STEEL BREATHER VENT which allows air flow to prevent condensation. Our vent is installed on the top of the case, unlike other brands where the vent is positioned below, catching rain and dirt.
HOLD-DOWN STRAP GROOVES
HOLD-DOWN STRAP GROOVES on the case keep straps securely in place, so no need to worry about your batteries staying where they belong.
BUILT-IN BLUETOOTH
BUILT-IN BLUETOOTH connects to the Millertech App. For iOS and Android, the app gives you real-time data, including remaining capacity, voltage, current and temp. for up to six batteries all in the same app!
BATTERY MANAGEMENT SYSTEM
The built-in BATTERY MANAGEMENT SYSTEM (BMS) prevents overcharge, over-discharge, internal over-temperature, voltage, short circuit and provides prismatic cell protection, making them one of the safest lithium batteries on the market. The LOW VOLTAGE ALARM notifies you before the voltage gets too low!
Marine Battery Lineup & Specs
Millertech’s Marine Battery Lineup is engineered to meet the power demands of every angler and boater. Whether you need dependable 12V power for electronics and accessories, a versatile dual-purpose battery for starting and house loads, cold-weather performance with heated technology, optimized 16V power for today’s advanced sonar systems, or high-capacity 24V and 36V batteries for trolling motors, Millertech offers a lithium solution designed for reliability, longer runtime, and reduced weight. Explore the lineup below to compare specifications, applications, and key advantages to find the ideal battery for your boat and the way you spend time on the water.
Voltage/Capacity: 12V 15Ah, 12V 22Ah, 12V 40Ah, 12V 55Ah, 12V 100Ah
Application: Marine electronics & auxiliary power
Built-in BMS: Yes
Advantages:
- Stable voltage for sensitive electronics
- LiFePO4 is a Lightweight replacement for lead-acid
- Clean, reliable power throughout the day
Ideal For:
- Fish finders, livewells, lighting, small 12V setups
16V Marine Electronics
Voltage/Capacity: 16V 65Ah, 16V 80Ah, 16V 150Ah
Application: High-performance marine electronics
Built-in BMS: Yes
Advantages:
- Optimized voltage for modern fish finders & sonar
- Improved performance for forward-facing sonar systems
- LiFePO4 is Lightweight, efficient power delivery
Ideal For:
- High-draw electronics, large display fish finders, forward-facing sonar, advanced 16V electronics systems
24V Marine Deep Cycle
Voltage/Capacity: 24V 50Ah, 24V 80Ah
Application: Trolling motors & marine propulsion systems
Built-in BMS: Yes
Advantages:
- Strong, consistent power under heavy trolling loads
- Extended runtime compared to lead-acid systems
- LiFePO4 offers reduced weight without sacrificing performance
Ideal For:
- 24V trolling motors, mid-size boats, long days on the water, multi-battery bank setups
36V Marine Deep Cycle
Voltage/Capacity: 36V 50Ah, 36V 60Ah, 36V 105Ah
Application: High-thrust trolling motors & demanding marine setups
Built-in BMS: Yes
Advantages:
- Maximum power delivery for high-thrust applications
- Stable voltage for consistent motor performance
- Designed for extended runtime and reliability
Ideal For:
- 36V trolling motors, tournament boats, heavy loads, anglers running multiple accessories
Voltage/Capacity: 12V 300Ah, 24V 80Ah, 36V 60Ah, 12V 100Ah Dual Purpose, 12V 135Ah Dual Purpose
Application: Allows the battery to charge in sub-freezing temperatures
Built-in BMS Yes
Advantages:
- Automatic internal heating in low temperatures
- Reliable charging in cold weather
Ideal For:
- Early spring, late fall, & cold-climate boating
Voltage/Capacity: 12V 40Ah, 12V 100Ah, 12V 135Ah, 12V 190Ah
Application: Starting & house power
Built-in BMS: Yes
Advantages:
- High burst power for engine starts
- Consistent output for electronics
- Reduces the need for multiple batteries
- Capable of cranking
Ideal For:
- Boats needing a single, versatile power solution
Have Questions?Get in touch with our customer service department
What Our Customers Think?
This is my second battery from Millertech and the shipping is incredibly fast. The price and quality of these batteries are unbeatable. - John
12V 100Ah Sport Series Lithium Group Size 24 Bluetooth Battery (12100G24)
I am amazed at the technology that's in this battery I fished all day today for the first time after installing the 135Ah cranking battery with my two lowrance HDs 12 live screens on all day when I got home and check the health of the battery it was at 99% - Michael
12V 135Ah Dual Purpose Starting Battery w/ BT (12135-DP)
Running 3 graphs and live scope. Battery set up is two 12V 135Ah in parallel I crank and run everything off of those. My trolling motor setup is 2 36V 50Ah. I can comfortably without a shadow of a doubt fish two long days without a charge - Blake O.
12V 135Ah Dual Purpose Starting Battery w/ BT (12135-DP)
What the pros are saying about MillerTech batteries
