What Are Boat and Marine Lithium Batteries
Marine batteries are robust batteries designed to deliver uninterrupted long-term energy output in harsh aquatic conditions, including moisture, salinity, and constant motion.
Lithium marine batteries feature thicker plates, rugged casings, and specialized designs, making them highly durable and energy-efficient. These batteries offer high energy density, faster charging, and a longer lifespan. There are three types of boat batteries:
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Battery Type
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Use
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Starting Battery
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Delivers a short, powerful burst of energy to start the boat engine
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Deep Cycle Battery
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Provides steady power over long periods to run onboard appliances, electronics, and trolling motors
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Dual Purpose Battery
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Combines starting power with limited deep-cycle capability
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Choosing the Right Deep Cycle Marine Battery for Your Needs
A deep-cycle battery is designed to provide a steady, continuous supply of power for an extended period of time. It can be deeply discharged and recharged repeatedly without damage. You can safely discharge it to 50–80% of its capacity.
Know Your Power Needs
Find the required Amps (A) for each device/appliance.
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If the power requirement is labeled in watts, then divide it by 12.
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Estimate how long you will run each device:
Amps × Hours = Ah
If you are planning to buy a lithium-ion marine battery (highly recommended), add 20% for a safety buffer.
Key Specs
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Amp-Hours (Ah)
Ah indicates the total energy capacity of the battery and how long it can supply power.
A 60Ah battery supplies 6 amps for 10 hours, or 3 amps for 20 hours, or 1 amp for 60 hours.
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Reserve Capacity (RC)
Reserve Capacity (RC) shows how long the battery can continuously deliver power under a standard load before the voltage drops to a minimum level.
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Group Size
Group Size refers to the physical dimensions and terminal placement of the battery to ensure a proper fit in your boat’s battery tray.
Chemistry
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Feature
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Flooded Lead-Acid (FLA)
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AGM (Sealed)
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Lithium (LiFePO₄)
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Upfront Cost
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Cheapest
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Low
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Moderate
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Maintenance
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High
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None
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None
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Lifespan (cycles)
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300–500
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500–1,000
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3,000–5,000+
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Usable Capacity
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50% (don't drain lower)
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50–60%
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80–100%
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Weight
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Heavy
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Heavy
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Ultralight
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Best For
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Budget setups/Occasional use
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Most recreational boaters
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Long boat trips
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Why Lithium Iron Phosphate Marine Batteries?
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Lightweight
Lithium iron phosphate boat batteries are typically 50% to 70% lighter than lead-acid batteries. They are not only easy to install or transport but also help improve fuel efficiency, top speed, and maneuverability by reducing weight.
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More Usable Power
LFP batteries can be safely discharged to 100% and maintain a steady voltage until nearly dead.
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Faster Charging & High Efficiency
You can fully charge your LFP battery in just 1–3 hours. They are nearly 99% efficient at absorbing a charge.
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Massive Lifespan
An LFP battery typically offers 3,000 to 5,000+ cycles. One lithium iron phosphate battery can outlast 5 to 10 sets of lead-acid batteries.
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Safety and Maintenance
LFP chemistry is incredibly stable, making lithium iron phosphate batteries much less prone to "thermal runaway" or fire. They don’t emit toxic or explosive gases and therefore don’t require specialized ventilation.
LFP batteries are completely sealed and require zero physical upkeep. Lithium iron phosphate batteries are equipped with a Battery Management System (BMS) that performs automatic health checks and protects against overheating, short circuits, overcharge, and over-discharge. You can also use our Enexer: Connect™ app for real-time tracking of your Enexer lithium deep-cycle marine battery health.
Deep Cycle Marine Battery Benefits
These "marathon runners" offer the following benefits:
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Consistent flow of energy for hours
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Deep discharge capability
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Hundreds or even thousands of "cycles"
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Vibration and shock resistance
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Long-term reliability and safety
What Size Lithium Boat Battery Do You Need?
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Boat Type
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Typical Electrical Loads
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Recommended Battery Size
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Small Boat
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Fishfinder, navigation lights, stereo
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50–100 Ah
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Mid-Size Boat
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Electronics, cabin lights, anchor windlass
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100–200 Ah
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Large Cruising Boat
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Fridge, microwave, autopilot, onboard systems
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200–400 Ah or more
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12 V vs 24 V
12V systems are compatible with lights, fishfinders, radios, and other low-power equipment on small boats.
24V systems are designed to handle bigger loads more efficiently in larger boats equipped with high-power equipment.
Free Shipping On All Lithium Boat and Marine Batteries
We offer free standard ground shipping on all orders to any location within Canada. We also ship our batteries to most countries worldwide.
