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10 Best Lithium Deep Cycle Batteries 2025 in the United States

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Our Top Picks

#1

Winner

LiTime 12V 100Ah LiFePO4 Battery BCI Group 31 Lithium Battery Built-in 100A BMS, Up to 15000 Deep Cycles, Perfect for RV, Marine, Home Energy Storage

Rating
9.8
Chosen by1,407
Capacity (Ah)
Voltage (V)
Cycle Life

Most important from
4109 reviews

Capacity (Ah)
LiFePO4 chemistry allows deeper discharges down to 20% capacity without damage, unlike lead-acid batteries which should not be discharged past 50%.
Voltage (V)
The battery maintains a very flat voltage curve until near depletion, requiring careful voltage monitoring at rest to accurately assess remaining capacity.
Cycle Life
Users appreciate the fast charging capability and much longer cycle life compared to traditional lead-acid batteries, making it a cost-effective long-term investment.
Weight and Size
The battery is significantly lighter and easier to handle than lead-acid alternatives, making installation manageable even for a single person.
Charging Time
Users appreciate the fast charging capability and much longer cycle life compared to traditional lead-acid batteries, making it a cost-effective long-term investment.

The LiTime 12V 100Ah LiFePO4 battery is a strong choice for deep cycle use, especially in RVs, marine setups, solar systems, and off-grid power. It offers a solid 100 amp-hour capacity at 12 volts, which is standard for these applications. One of its biggest advantages is the exceptionally long cycle life—between 4,000 to 15,000 cycles depending on how deeply you discharge it—far surpassing traditional lead-acid batteries that typically last only a few hundred cycles. This means you can expect up to 10 years of reliable use, making it a cost-effective option over time. The battery’s built-in Battery Management System (BMS) enhances safety and performance, with certifications like UL and UN38.3 reassuring its quality and safety. Weighing just 24.2 pounds, it is much lighter than comparable lead-acid batteries, which makes installation and transport easier.

This battery maintains a steady voltage during discharge, providing about 95% usable capacity, so you get more consistent power without the memory effect seen in older battery types. The battery size fits a standard Group 31 case, which is common for many applications, though if you need a smaller or lighter pack, LiTime offers alternative versions. It is designed for energy storage rather than starting engines, so it’s not suitable as a starter battery. The 5-year warranty and responsive customer support add confidence for buyers.

Charging time specifics aren’t detailed, so you might need a compatible charger optimized for LiFePO4 chemistry. Its price tends to be higher upfront compared to lead-acid batteries, though the longer lifespan helps justify that. When seeking a lightweight, long-lasting, and efficient battery for deep cycle use with strong safety certifications, the LiTime 12V 100Ah LiFePO4 represents a reliable pick, especially for solar, RV, or marine power storage.

Rating
9.8
Chosen by1,407
Capacity (Ah)
Voltage (V)
Cycle Life

Most important from
4109 reviews

Capacity (Ah)
LiFePO4 chemistry allows deeper discharges down to 20% capacity without damage, unlike lead-acid batteries which should not be discharged past 50%.
Voltage (V)
The battery maintains a very flat voltage curve until near depletion, requiring careful voltage monitoring at rest to accurately assess remaining capacity.
Cycle Life
Users appreciate the fast charging capability and much longer cycle life compared to traditional lead-acid batteries, making it a cost-effective long-term investment.
Weight and Size
The battery is significantly lighter and easier to handle than lead-acid alternatives, making installation manageable even for a single person.
Charging Time
Users appreciate the fast charging capability and much longer cycle life compared to traditional lead-acid batteries, making it a cost-effective long-term investment.
#2

Litime 12V 100Ah TM Low-Temp Protection LiFePO4 Battery Built-in 100A BMS, Group 31 Deep Cycle, Lithium Iron Phosphate Battery Perfect for Trolling Motors, Yacht, Marine, Boat, RV, Home Energy

Rating
9.6
Voltage (V)
Weight and Size

Most important from
4109 reviews

Voltage (V)
It fits perfectly on our boat to run our trolling motor with high voltage, ensuring no loss of power.
Weight and Size
Switching from lead-acid to lithium is like night and day; the weight reduction and consistent power are fantastic.

The LiTime 12V 100Ah TM LiFePO4 battery is a solid choice for users needing a reliable deep cycle battery, especially suited for marine applications like trolling motors. Its impressive specs include a capacity of 100Ah and a voltage of 12V, which is ideal for various energy needs, from boats to RVs. One of its standout features is the built-in 100A Battery Management System (BMS) that offers extra protection against common issues like overcharging, overheating, and short circuits. The low-temperature cut-off ensures it performs well even in cold conditions, which is a great advantage for those using it in harsher environments. With a cycle life of over 4,000 at 100% depth of discharge, it outlasts traditional lead-acid batteries by a significant margin, promising a lifespan of around 10 years or more.

The battery does have some drawbacks. Weighing 46 pounds, it may be heavier than some users prefer, which could be an issue for those needing to transport it frequently. Its size (6.77 x 13 x 8.43 inches) also requires ample space for installation. Additionally, while it comes with a 5-year warranty, some users might find customer service response times vary.

This battery is excellent for those looking for a durable, long-lasting power source for marine use and other applications, but potential buyers should consider its weight and installation requirements before purchase.

Rating
9.6
Voltage (V)
Weight and Size

Most important from
4109 reviews

Voltage (V)
It fits perfectly on our boat to run our trolling motor with high voltage, ensuring no loss of power.
Weight and Size
Switching from lead-acid to lithium is like night and day; the weight reduction and consistent power are fantastic.
#3

LiTime 12V 100Ah BCI Group 24 LiFePO4 Battery, 100A BMS Rechargeable Lithium Battery with Up to 15000 Cycles, 1.28kWh -Higher Energy Density, Perfect for RVs, Van, Trailer, MotorHome and Boats

Rating
9.4
Capacity (Ah)
Voltage (V)
Weight and Size

Most important from
4109 reviews

Capacity (Ah)
After a year of rigorous use in a skoolie conversion, the battery shows no signs of capacity loss, handling high-amperage demands like electric water heaters with ease.
Voltage (V)
The battery excels in versatility, powering everything from 12V devices to high-powered inverters and even hobby chargers efficiently.
Weight and Size
Lightweight and easy to install, it's perfect for creating a portable power station, providing reliable backup during power outages.

The LiTime 12V 100Ah BCI Group 24 LiFePO4 Battery is a versatile and high-performance option for deep-cycle applications like RVs, vans, trailers, motorhomes, and boats. It boasts a high energy density, with 1.28kWh of energy, and is significantly lighter and more compact than traditional AGM batteries, making it easier to install and manage.

Its ability to expand up to 20.48kWh makes it a flexible choice for larger energy needs, including home backup systems or off-grid living setups. The battery's robust Battery Management System (BMS) ensures protection against common issues like overcharging and overheating, which contributes to its long lifespan of up to 10 years and over 4000 cycles at full depth of discharge.

However, it is important to note that this battery is designed for energy storage rather than starting applications, which means it is not suitable for use as a starter battery or in high-drain devices like golf carts or jacks. For those needing a battery for trolling motors or general energy storage, specific models are recommended by LiTime. The LiTime battery is praised for its reliability and performance, making it a solid investment for those needing a dependable deep-cycle battery solution.

Rating
9.4
Capacity (Ah)
Voltage (V)
Weight and Size

Most important from
4109 reviews

Capacity (Ah)
After a year of rigorous use in a skoolie conversion, the battery shows no signs of capacity loss, handling high-amperage demands like electric water heaters with ease.
Voltage (V)
The battery excels in versatility, powering everything from 12V devices to high-powered inverters and even hobby chargers efficiently.
Weight and Size
Lightweight and easy to install, it's perfect for creating a portable power station, providing reliable backup during power outages.

Buying Guide for the Best Lithium Deep Cycle Batteries

When choosing a lithium deep cycle battery, it's important to understand the key specifications that will determine how well the battery will meet your needs. These batteries are commonly used in applications such as solar energy storage, RVs, boats, and electric vehicles. The right battery for you will depend on factors like the energy requirements of your devices, the space available for the battery, and how often you plan to use it. By understanding the key specifications, you can make an informed decision and select a battery that will provide reliable performance and longevity.
Capacity (Ah)Capacity, measured in ampere-hours (Ah), indicates how much energy the battery can store. This is important because it determines how long the battery can power your devices before needing a recharge. Batteries with higher capacity can store more energy, making them suitable for applications with higher energy demands or longer usage periods. For light usage, such as powering small electronics, a lower capacity battery (20-50 Ah) may suffice. For more demanding applications like running appliances in an RV or boat, you might need a higher capacity battery (100 Ah or more). Consider your energy consumption needs to choose the right capacity.
Voltage (V)Voltage is the electrical potential difference provided by the battery. Most lithium deep cycle batteries come in standard voltages such as 12V, 24V, or 48V. The voltage you need depends on the requirements of your system or devices. For example, many RVs and boats use 12V systems, while larger solar energy storage systems might use 24V or 48V batteries. Ensure that the battery voltage matches the voltage requirements of your application to avoid compatibility issues and ensure efficient operation.
Cycle LifeCycle life refers to the number of complete charge and discharge cycles a battery can undergo before its capacity significantly degrades. This is important because it affects the battery's longevity and cost-effectiveness. A higher cycle life means the battery will last longer and provide more value over time. For occasional use, a battery with a cycle life of 2000-3000 cycles may be sufficient. For daily use, such as in solar energy systems, look for batteries with a cycle life of 4000 cycles or more. Consider how often you will be using the battery to determine the appropriate cycle life.
Depth of Discharge (DoD)Depth of Discharge (DoD) indicates the percentage of the battery's capacity that can be used before it needs to be recharged. A higher DoD means you can use more of the battery's capacity without damaging it. This is important for maximizing the usable energy from the battery. For example, a battery with a DoD of 80% allows you to use 80% of its capacity before recharging. If you need to use a large portion of the battery's capacity regularly, look for a battery with a high DoD (80-100%). For less frequent or partial discharges, a lower DoD may be acceptable.
Weight and SizeWeight and size are practical considerations, especially if you have limited space or need to move the battery frequently. Lithium deep cycle batteries are generally lighter and more compact than their lead-acid counterparts, but there can still be significant variations. If space is a constraint, measure the available area and choose a battery that fits comfortably. For portable applications, such as in RVs or boats, consider the weight to ensure it can be handled easily. Balancing capacity and size/weight is key to finding a battery that meets your needs without being cumbersome.
Charging TimeCharging time is the duration it takes to fully recharge the battery. This is important for planning how often and how long you need to charge the battery to keep your devices running. Faster charging times are convenient but may require a more powerful charger. If you have access to a reliable power source and can charge the battery overnight, a longer charging time may be acceptable. For applications where quick turnaround is essential, such as in electric vehicles, look for batteries with shorter charging times. Consider your charging infrastructure and how quickly you need the battery to be ready for use.

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