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Deep Cycle Marine Battery​

Upgraded Power for Your Marine Life

For marine professionals who refuse to compromise, WattCycle's deep-discharge marine battery​ redefines on-water power standards. Our highest quality lithium marine batteries are equipped with EV-grade A+ LiFePO4 cells, delivering 5000 - 15.000 cycles of life and ensuring reliable power and long-lasting performance. Built for durability and efficiency, our lithium batteries for boats let you stay on the water longer.

  • Born for Trolling Motor

    Designed for Marine

    WattCycle's deep cycle marine batteries feature an IP67-rated enclosure that shields against dust, water, and the elements, can be used whether you are in extreme temperatures or rain.

  • Reliable Marine Power

    Adopted with Top-tier LiFePO4-technology, WattCycle’s deep cycle marine batteries offer more charge cycles and reduced replacement costs, compared with traditional marine batteries.

  • Real-Time Monitor

    Revolutionize onboard power management with WattCycle's Smart BMS Integration. With Bluetooth 4.0/5.0, you can easily monitor your deep cycle marine battery​ with no need for an extra battery monitor.

  • Lightweight and Portable

    Compared to traditional lead-acid batteries, WattCycle's batteries are more than 1/3 lighter but have twice the power and energy, allowing your marine equipment to last longer.

Marine Boats

Kickstarts Your Ocean Exploration Journey

Choosing the right deep cycle marine battery​ depends on your boat's size, power requirements, and your usage. For small boats, you can choose 12V 100Ah series batteries. For larger boats, WattCycle recommends you choose 12V 200Ah - 280Ah. WattCycle's high-capacity batteries meet your various marine needs.

a middle-aged man fishing on a boat

Lithium Marine Battery Types

Deep Cycle Marine Battery: AGM Batteries Or Lithium Batteries?

When chossing deep cycle marine batteries for your boat, there is always a question of whether to choose AGM batteries or lithium batteries. It's important to consider each option's performance, durability, and long-term value.

  • AGM Deep Cycle Batteries: AGM batteries are known for their durability and low maintenance, making them a popular choice in marine environments. However, they tend to be heavier and have a shorter lifespan compared to lithium batteries. With a limited depth of discharge (DOD) of around 50%, AGM batteries require more frequent charging, reducing their overall efficiency over time.

  • Lithium Deep Cycle Batteries: Lithium deep cycle marine batteries offer numerous advantages. Their significant advantages are that they are lightweight, long-lasting, and can be discharged up to 90% or more without any negative impact. Even some of lithium deep cycle marine batteries are built-in Bluetooth, giving you real-time monitoring of your battery’s state with ease. These batteries recharge faster and require minimal maintenance, making them ideal for boaters seeking reliable, long-term power.

If you have limited space on your boat and require a lighter battery, then the lithium deep cycle marine battery is your best choice. If you have a very large boat and a limited budget, AGM deep cycle marine batteries are also the best choice.

Real Stories About WattCycle Deep Cycle Marine Battery

My first lithium battery

The shipping was extremely fast. I am using this battery to power marine electronics. I highly recommend it.

Stein Lichner from Real American Customer

Perfect Fit for My Boat's Solar Setup!

Great price, bought 4 (100 ah batteries) to replace my boat's house battery bank that is charged by a 400 watt solar array with a marine midnight kid charge controller. Will install in about 6 weeks and will do a follow-up review, but so far, my temu experience has been 5 star. Items arrived fast and well packed. All 4 read 13.4v s on volt meter.

Josh Goldberg from Real American Customer

Best LiFePO4 battery I’ve used!

When trolling on my kayak, this battery is the best purchase I've ever made. It is lightweight and the ability to monitor the battery via an app anytime and anywhere is a huge advantage for a kayak. Its performance is better than any other marine battery I've used. On my trolling motor, this battery has a longer runtime than any other brand I've tried. Another huge advantage is the fast charging speed of this battery. Its compact size makes it ideal for installation in any power distribution box. I recommend this product to any buyer who wants to buy a new lithium battery.

Carlo from Real American Customer

Know More About Deep Cycle Marine Battery Information

What is a deep cycle marine battery?

Engineered to provide consistent, long-lasting power over extended periods, deep cycle marine batteries are ideal for powering trolling motors, navigation systems, and onboard electronics. These deep cycle batteries can withstand deep discharges and repeated recharges without degrading quickly, offering exceptional longevity.

Are all marine batteries deep cycle?

Not really, but most marine batteries are designed as deep cycle batteries due to their ability to handle prolonged energy usage. The right deep cycle marine battery is essential for boaters who need reliable power over extended periods.

How long will a marine battery last?

The lifespan of a marine battery depends on multiple factors like frequency of use, charging method, and battery type. If you choose to use a lithium deep cycle marine battery and with proper maintenance, you can use it for more than 10 years. Our batteries use EV grade A+ LiFePO4 cells and advanced BMS, which can support 5000 - 15.000 cycles and 100% DOD.

What is a marine battery used for?

As mentioned in the text above, marine batteries are roughly divided into three categories: cranking battery, lithium deep cycle marine battery, and dual-purpose battery. Cranking batteries are mostly used to start engines; lithium deep cycle batteries are used to run electronics; dual-purpose batteries not only start engines but also run electronics (ideal for small boats with limited space).

Do marine batteries need maintenance?

Depends on the type of marine battery you choose. If you choose WattCycle lithium deep cycle marine batteries, then there is almost no maintenance required; if you choose AGM batteries or GEL batteries, then you will need to perform regular maintenance.

Can I use a deep cycle marine battery for both starting and powering electronics?

Unfortunately if you want to start the engine and power your equipment at the same time, a deep cycle marine battery won't do it. If you have this need, WattCycle recommends that you choose a dual-purpose battery.

What is the best way to charge a lithium deep cycle marine battery?

WattCycle recommends 3 charging methods: AC - DC LiFePO4 battery charger, Solar panel with solar controller, and DC generator with DC - DC charger. If possible, WattCycle recommends using an AC-DC LiFePO4 battery charger.

Deep cycle battery or dual purpose battery which is good for your boat?

This depends on the space you have for placing batteries on your boat and the purpose of the batteries. If your boat has a lot of space and you need batteries to start the engine and power your equipment, WattCycle recommends that you buy cranking batteries to start the engine and lithium deep cycle marine batteries to power your equipment; if your boat has limited space and the above needs also exist, then it is recommended to choose dual-purpose batteries.

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