Are you looking for a reliable lithium marine battery manufacturer in the U.S. that can deliver high-performance, long-lasting, and safe power solutions for your vessel?
At Copow Battery, we understand that choosing the right battery isn't just about voltage or capacity-it's about matching your specific marine applications, ensuring safety compliance, and having a partner you can trust for the long haul.
In this guide, we've put together a curated overview of the top lithium marine battery brands in 2025, including Copow Battery, Battle Born, RELiON, and more. Explore their performance, certifications, and support offerings-and discover how the right choice can make your next marine project safer, more efficient, and worry-free.
1. Copow Battery – Chinese Lithium Marine Battery Manufacturer Serving the U.S. Market
Copow Battery is a LiFePO₄ marine battery manufacturer under Shenzhen Huandu Technology, serving the U.S. market with high-safety, long-life marine power solutions.
Using automotive-grade A-class cells from CATL and EVE Energy with an intelligent BMS, Copow offers 12V–36V deep-cycle marine batteries with over 4,000 cycles, IP65 protection, and plug-and-play lead-acid replacement. With strong production capacity, international certifications, customization options, and long-term warranties, Copow is a reliable and cost-effective supplier for marine applications.
Battery Performance and Durability
- Automotive-grade A-class LiFePO₄ cells + self-developed BMS, 4,000+ cycles, 5–10-year lifespan.
- -20℃ to 60℃ operating range, IP65 protection, plug-and-play lead-acid replacement, low maintenance.
Safety Certifications and Product Compliance
- Certified to UN38.3, CE, MSDS, ISO9001, etc., meeting U.S. import and safety standards.
- Multi-layer BMS protection against overcharge, over-discharge, short circuit and overheating.
Supply Capability and After-Sales Support
- 32,000 m² base, 10 GWh+ annual capacity, supports size/interface customization and stable bulk delivery.
- 5–10-year warranty, fast technical support tailored to the U.S. market.
2. Battle Born Batteries – Leading U.S. LiFePO₄ marine deep-cycle battery brand
Battle Born Batteries is a well-known lithium iron phosphate deep-cycle battery brand under U.S.-based Dragonfly Energy. It was founded in 2013 by battery scientist Dr. Denis Phares, with both its headquarters and manufacturing facilities located in Reno, Nevada. The brand primarily serves marine, RV, and off-grid energy storage applications, offering lightweight, maintenance-free, and long-life lithium batteries as replacements for traditional lead-acid batteries.
Lithium Battery Performance and Longevity
- Adopts LiFePO₄ chemistry, supports 100% deep discharge, and charges 5x faster than lead-acid batteries.
- 3,000–5,000 cycle life, with self-developed BMS to extend service life.
Certified Safety Standards and Compliance
- Holds UL 62133, UN38.3 certifications; complies with ABYC E-13 marine standards.
- Built-in BMS for multiple protections; LiFePO₄ system features high thermal stability.
Manufacturing Capacity and After-Sales Service
- U.S. local manufacturing with cumulative deliveries over 400,000 units.
- 10-year warranty, plus dedicated technical team for full-process installation & after-sales support.
3. RELiON Battery – High-performance lithium batteries for marine use
RELiON Battery is a global LiFePO4 deep-cycle battery brand founded in 2014 and headquartered in South Carolina, USA. It is currently a subsidiary of Brunswick Corporation. The brand primarily serves marine, RV, and solar energy storage applications, offering multiple voltage options in BCI-standard sizes that allow direct replacement of traditional lead-acid batteries. RELiON batteries are certified to UL, UN38.3, and other international standards, and come with up to an 8-year warranty and U.S.-based technical support.
Marine Battery Reliability and Lifespan
- LiFePO₄ chemistry, 3,000–5,000 cycles, 10× longer life than lead-acid.
- 100% deep discharge, 5× faster charging, built-in BMS for protection.
Product Safety Certifications and Regulatory Compliance
- UL 62133, UN38.3, CE certified; complies with ABYC E-13 marine standard.
- BMS guards against overcharge/over-discharge; high thermal stability.
Supply Reliability and Customer Support
- U.S.-made, global distribution network for stable supply.
- 10-year warranty, full-cycle technical support (pre-sales to after-sales).
4. Dakota Lithium – Lightweight, long-cycle lithium marine batteries
Dakota Lithium is a LiFePO₄ battery brand founded in Seattle, USA in 2008. It specializes in lightweight, long-cycle deep-cycle batteries for marine and RV applications. Leveraging its proprietary nanoparticle cathode technology, the brand achieves a cycle life of 3,000–10,000 times. Its products hold certifications such as UL and UN38.3, comply with marine standards, come with a maximum 11-year warranty, and ensure stable supply through U.S.-based manufacturing and a global distribution network.
Battery Efficiency and Durability
- LiFePO₄ chemistry, 3,000–10,000 cycles (4–10× that of lead-acid), supports 100% deep discharge and 5× faster charging.
- Built-in BMS, -20°C to 65°C operating range, IP67 rating for some models, maintenance-free and 50–60% lighter than lead-acid.
Compliance with Industry Safety Standards
- UL 62133/1642, UN38.3, CE certified; factory ISO 9001:2015 compliant and meets ABYC E-13 marine standards.
- BMS provides overcharge/over-discharge/over-temperature/short-circuit protection; compliant with international transport regulations.
Production Capability and Post-Sales Support
- U.S.-based manufacturing, 400,000+ cumulative deliveries, global distribution network for stable supply.
- Up to 11-year battery warranty, 1-year parts warranty, full-cycle technical support from pre-sales consultation to after-sales troubleshooting.
5. Lithionics Battery – Premium lithium battery systems for yachts
Lithionics Battery is a high-end lithium iron phosphate (LiFePO₄) battery system manufacturer founded in 2010 and headquartered in Clearwater, Florida, USA. It was acquired by Winnebago Industries in 2023. The brand primarily serves yachts, RVs, and other premium marine, land leisure, and industrial energy storage applications, offering safe, durable, and customizable power solutions.
Performance and Endurance of Lithium Batteries
- LiFePO₄ cells, 2,300 cycles at 90% DoD/5,800 cycles at 50% DoD, 1–4 hour fast charging, 2–5% monthly self-discharge.
- Patented NeverDie BMS, -20°C to 65°C operation, IP66 protection, 50–60% lighter than lead-acid, rebuildable with up to 20-year working life.
Safety Approvals and Regulatory Requirements
- UL 1973/1642, UN38.3, CE certified; factory ISO 9001:2015 compliant and meets ABYC E‑13 marine standards.
- Aircraft-grade aluminum enclosure (crush/impact tested), BMS guards against overcharge/over-discharge/over-temperature/short circuit; meets UN DOT transport rules.
Stable Supply Chain and After-Sales Assistance
- U.S.-based manufacturing, acquired by Winnebago Industries (2023), global distribution for steady inventory and delivery.
- Up to 10-year standard warranty, lifetime BMS firmware updates, full-cycle technical support (pre-sales to post-sales troubleshooting).
6. Dragonfly Energy – U.S. manufacturer of smart marine lithium batteries
Dragonfly Energy, originating in Reno, Nevada, USA in 2013 and officially established in 2016, is a manufacturer of smart marine lithium iron phosphate batteries. Its core businesses include lithium-ion battery cell manufacturing, battery pack assembly and system integration. Its subsidiary brand Battle Born Batteries is a well-known deep-cycle lithium battery brand in the industry, with over 400,000 battery packs deployed worldwide, widely used in scenarios such as yachts, RVs, heavy-duty trucks, oil and gas industries, and off-grid energy storage.
Long-Lasting Battery Performance
- LiFePO₄ chemistry, 3,000–5,000 cycles at 100% DoD, 5× faster charging, 2–3% monthly self‑discharge, 50–60% lighter than lead‑acid.
- Proprietary BMS, -20°C to 57°C operating range, optional internal heating, Dragonfly IntelLigence™ for wireless monitoring.
Certified Compliance and Product Safety
- UL 62133, UN 38.3, CE, Class 1 Division 2 (C1D2) certified; PFAS‑free, non‑toxic LiFePO₄ chemistry.
- BMS protects against overcharge/over‑discharge/over‑temp/short circuit; UL‑listed cylindrical cells, drop‑in lead‑acid replacement.
Delivery Capacity and Technical Support
- US‑based manufacturing & assembly, global distribution, pre‑wired systems for OEM efficiency, 400,000+ packs deployed worldwide.
- 10‑year warranty, full‑cycle technical support, OEM training, Dragonfly IntelLigence™ app for remote monitoring.
7. Corvus Energy – Lithium energy storage systems for commercial vessels
Corvus Energy was founded in Canada in 2009 and relocated its headquarters to Bergen, Norway in 2018. It is a global leader in zero-emission energy storage solutions for commercial vessels, holding a global market share of over 50%.
The company specializes in providing modular lithium-ion energy storage systems and hydrogen PEM fuel cell systems for maritime, offshore and port applications.
Its core products include the Orca ESS, Blue Whale and Dolphin NxtGen product lines, which are suitable for a wide range of vessel types such as ferries, cruise ships and offshore workboats. Corvus Energy has completed more than 1,300 project deliveries, with a cumulative installed capacity exceeding 1,300 MWh and total operational hours surpassing one million.
Durable and High-Performing Lithium Batteries
- Adopts cobalt-free LFP cells, boasts up to 15-year lifespan and 1C charge/discharge rate, with patented 4th-gen BMS for stable operation.
- Modular design, cloud-based remote monitoring, proven by 1,300+ projects, 1,300MWh+ installed capacity and 1M+ operational hours in harsh maritime conditions.
Meeting Safety Regulations and Certification Standards
- Holds DNV, LR, ABS, BV, RINA type approvals and DNV Cyber Security Approval, complies with SOLAS and maritime class rules.
- Features passive single-cell thermal runaway isolation, hardware failsafes against overcharge/overtemp/short circuit, and IP44/IP66 protection.
Supply Strength and After-Sales Service Quality
- Global manufacturing bases in Canada, Norway and US; modular pre-configured systems enable fast delivery with diversified sourcing.
- 24/7 technical support, Vessel Information Portal for remote monitoring, and full life cycle services including training, maintenance and recycling.
8. Trojan Battery Company – Established battery brand entering marine lithium
Founded in 1925 and headquartered in Santa Fe Springs, California, USA, Trojan Battery Company is a world-renowned deep-cycle battery manufacturer with a century of heritage. The company pioneered deep-cycle batteries specifically designed for golf carts in 1952. Its current product portfolio covers a wide range of types including flooded lead-acid batteries, absorbed glass mat batteries, valve-regulated lead-acid batteries and lithium-ion batteries, which are widely used in golf carts, utility vehicles, material handling equipment, floor care equipment and marine applications.
Battery Strength and Operational Life
- Lithium models use LiFePO4 chemistry, 6th‑gen BMS, up to 10‑year lifespan; AES AGM delivers 3x cycle life vs standard AGM, tested to 1,200 cycles at 100% DoD.
- Withstands extreme temps (-40°C to 60°C), SAE vibration standards, IP67 protection; supports fast opportunity charging (<4 hours) without damage.
Regulatory Compliance and Safety Assurance
- UL/ETL/FCC/CE certified, meets BCI, IEC, SAE standards; ISO 9001 certified manufacturing and quality systems.
- Lithium has 4‑level safety redundancy, 5 internal temp sensors; AGM non‑spillable, 80% recycled materials, 99% recyclable.
Order Fulfillment and Ongoing Customer Support
- US‑based manufacturing, global distribution network, Trojan Lithium Direct for one‑click ordering and fast shipping.
- 10‑year lithium warranty, 24/7 technical support, installation guidance, and full life‑cycle services covering training, spares, and recycling.
9. Discover Battery – Modular LiFePO₄ batteries for marine applications
Discover Battery is a globally leading manufacturer of lead-acid and lithium-ion energy storage solutions with over 70 years of industry experience. Headquartered in Vancouver, Canada, it has established multiple manufacturing facilities and sales offices worldwide. The company specializes in designing and producing power supply products for the transportation, motive power and energy storage sectors.
Its product portfolio includes flooded lead-acid batteries, absorbed glass mat batteries, gel batteries and lithium iron phosphate batteries, which are widely used in marine applications, golf carts, material handling equipment, floor care equipment and other scenarios. Its marine lithium iron phosphate batteries adopt a modular design, supporting flexible series and parallel connection for easy installation and capacity expansion.
Reliable Performance and Extended Battery Life
- LiFePO4 batteries deliver up to 10× the cycle life of lead-acid, support 1C fast charging, and feature IP67 protection for harsh marine environments.
- AGM/gel deep-cycle batteries offer 550+ cycles at 70% DoD, with stable operation in -40°C to 60°C temperatures and compliance with SAE vibration standards.
Industry Certifications and Safety Compliance
- Manufacturing facilities hold ISO 9001, ISO 14001 and OHSAS 18001 certifications; products are UL, CE and RoHS approved.
- Lithium models have UL94 V0 flame-retardant casings and multi-level BMS protection; lead-acid variants meet IATA/ICAO air transport standards.
Production Scale and After-Sales Support
- Global manufacturing bases in Canada and China, with a worldwide distribution network covering OEMs, fleets and rental clients.
- 10-year energy throughput warranty for lithium products, plus 24/7 technical support, installation guidance and full lifecycle recycling services.
10. Lithium Pros – High-power lithium batteries for marine use
Founded in 2011 in Knoxville, Tennessee, USA, Lithium Pros is a high-performance lithium battery manufacturer whose core team boasts over 25 years of experience in the racing and rotating electrical sectors.
The company specializes in designing, assembling and distributing lithium-ion battery packs for high-demand applications as replacements for traditional lead-acid batteries, with its business spanning racing, marine use, electric vehicle modification and other fields. Its marine lithium iron phosphate batteries feature high power output and lightweight design, covering product lines such as the TM Series, N Series and M Series. These batteries come with NMEA 2000 connectivity and Bluetooth monitoring functions, enabling real-time display of voltage, remaining capacity and other data.
Marine Battery Power and Longevity
- Its LiFePO4 marine batteries offer 3000+ cycles at 80% DoD, 3x faster charging than lead-acid, and flat discharge curves for stable power supply.
- Lightweight design cuts weight by 50% vs lead-acid; built - in BMS and corrosion - resistant casings ensure reliable operation in marine environments.
Safety Standards, Certifications, and Compliance
- Products meet ABYC/USCG standards, hold UL, CE, RoHS, NMEA 2000 and UN38.3 certifications.
- Integrated BMS prevents overcharge/overheat/short - circuit; casings are vibration - resistant and saltwater - corrosion - proof.
Supply Capability and Long-Term Customer Service
- It has US - based assembly and global distribution, offering TM/N/M series to cover trolling and marine electronics needs.
- It provides multi - year warranties, 24/7 technical support, on - site installation guidance and lifecycle recycling services.
How to choose the right Lithium Marine Battery manufacturer?
When choosing a marine lithium battery manufacturer in US, it is important to comprehensively consider whether the products are compatible with marine applications, their safety and certification compliance, technical capabilities, and after-sales support.
Clarify your core requirements
- Confirm battery specifications, including voltage, capacity, and dimensions, as well as the type of vessel it will be used on, such as commercial ships, recreational boats, or special operation vessels.
- Define performance requirements, such as cycle life, charging speed, and operating temperature range, while setting a budget range for selection.
Verify product safety and compliance certifications
- Ensure the products have obtained authoritative certifications, such as ATEX, UL, CE, and RoHS, and comply with marine-specific standards including ABYC and USCG.
- Pay attention to battery protection capabilities, such as IP rating, salt spray corrosion resistance, vibration resistance, and the multi-protection functions of the built-in Battery Management System (BMS).
Evaluate the manufacturer's technical and production strength
- Assess core technologies, such as cell R&D, BMS stability, modular design, and customized adaptation capabilities.
- Prioritize manufacturers with ISO certification, automated production lines, and sound testing processes by reviewing their production scale and quality control systems.
Consider supply capacity and after-sales support
- Understand production capacity stability and global distribution networks to ensure order delivery efficiency and long-term supply capabilities.
- Focus on after-sales services, including warranty period, 24/7 technical support, installation guidance, and battery recycling services.
Refer to market reputation and practical cases
- Research the brand's industry experience and customer reviews, and give priority to manufacturers with rich application cases in marine scenarios.
- Verify the actual user feedback on products, such as performance under extreme conditions and key indicators like failure and repair rates.
Take the next step
When exploring marine lithium batteries, choosing Copow Battery ensures safe, reliable, and long-lasting power for your vessel. Feel free to contact Copow to discuss your specific requirements and discover our customized solutions and professional technical support, making your next marine project efficient and worry-free.
