As the global maritime industry advances toward low-carbon and intelligent development, ship energy systems are undergoing profound transformation. Lithium battery packs, with their high energy density, rapid charge-discharge capabilities, and superior cycle life, have become a key power source driving ship electrification. In Germany, dual drivers—policy support for green shipping and market demand—have spurred the emergence of suppliers specializing in marine lithium-ion battery packs. These companies not only deliver safety solutions compliant with maritime standards but also demonstrate strong competitiveness in customized design and system integration. Below, we highlight ten representative suppliers in Germany’s marine lithium-ion battery pack sector, offering insights into this niche market.
Although XD THERMAL is not based in Germany and does not directly manufacture lithium battery packs for marine applications, we have long specialized in liquid cooling plates and battery thermal management solutions. Our liquid cooling plate products are widely used across multiple sectors including electric vehicles, energy storage systems, and marine applications. By circulating coolant, they efficiently regulate battery operating temperatures, ensuring system safety and stability. Compared to traditional cooling methods, these liquid cooling solutions offer significant advantages in thermal contact uniformity and system integration. Building on our expertise in thermal management, we closely monitor Germany’s advancements in marine lithium battery packs. Innovations from these leading companies are accelerating the development of green shipping and vessel electrification.
ThyssenKrupp Marine Systems (TKMS) began exploring lithium batteries for naval vessels as early as 2015, when they initiated R&D on lithium-ion battery systems for submarines. By 2019, initial test results proved promising, with many industry insiders viewing this as a breakthrough in submarine propulsion technology. This demonstrates TKMS’s consistent and steady progress in advancing the maturity of this technology. Recently, major news emerged: in August 2025, Canada announced the selection of TKMS and South Korea’s Hanwha Ocean as primary candidates for a major submarine contract. This project aims to enable submarines to operate continuously for three weeks in Arctic waters, presenting TKMS with an opportunity to showcase the international application of its lithium-ion battery technology. Concurrently, the company is actively participating in India’s Project-75I submarine program and plans to complete sea trials for its lithium-ion batteries and AIP systems by 2028 to further demonstrate the technology’s maturity and reliability.
The company has launched XPAND Pack, a battery solution specifically designed for the maritime industry. It supports high-power fast charging, boasts a long lifespan, and features a modular design that can be flexibly configured into bulk installations or battery racks to meet diverse vessel requirements. What’s more reassuring is that it has been certified by Lloyd’s Register, demonstrating reliable performance in vibration and shock resistance. Equipped with a liquid cooling system and BMS, it is suitable for both small vessels and large ships. What I find particularly noteworthy is that FEPS doesn’t just focus on R&D—it actively brings its products into real-world applications. Recently, the company continued its collaboration with Derecktor Shipyards in the U.S. to supply battery systems for Chatham Area Transit (CAT) in Savannah, Georgia. Building on the completion of battery installations for two ferries in 2024, a third hybrid ferry is now underway, scheduled for delivery by late 2026. It will feature a 307 kWh XMP 96P battery module. These projects demonstrate that FEPS batteries are not merely “paper technology” but are actively driving the advancement of marine electrification.
Leclanché has introduced a modular lithium-ion battery pack called the Marine Rack System (MRS), specifically designed for marine applications. It utilizes high-energy-density G/NMC lithium-ion cells manufactured in European facilities, assembled into robust modules, and enclosed in IP65-rated housings with water-cooling plates. This ensures stable performance even in the demanding environments encountered during marine operations. Notably, Leclanché has consistently demonstrated the practical implementation of this technology in real-world projects. Most recently, their next-generation Navius MRS-3 system successfully obtained certification from Lloyd’s Register and Bureau Veritas. This signifies not only technical refinement but also rigorous validation of safety and performance standards by leading international classification societies.
I’ve noticed Torqeedo has been consistently deepening its expertise in marine lithium-ion batteries. The launch of the Deep Blue Battery 80 isn’t just about doubling capacity—it’s a proactive response to range anxiety in boating. Meanwhile, their Power series makes electrification easier for lighter vessels. Even more impressive is that following Yamaha’s acquisition in 2024, Torqeedo has accelerated its R&D and market expansion by leveraging the group’s resources. It’s clear they’re not only iterating on marine lithium battery technology but also demonstrating a commitment to making green shipping a reality. If you’re seeking a company with extensive experience in marine lithium batteries that balances innovation with reliability, Torqeedo is definitely a worthy contender.
Although Büttner Elektronik primarily focuses on providing power solutions for outdoor and mobile applications, their LiFePO₄ battery packs are also exceptionally well-suited for light vessels or as backup power sources onboard due to their high cycle life, excellent thermal performance, and compact design. Moreover, Dometic recently unveiled its new generation of mobile power products at the Caravan Salon trade show in Düsseldorf, Germany, which includes LiFePO₄ batteries. These batteries seamlessly integrate with inverters, chargers, and smart display devices via Dometic’s proprietary N-BUS communication protocol, enabling more efficient monitoring and management of power systems. This solution is not only suitable for motorhomes and outdoor scenarios but also performs effectively on vessels.
EAS Batteries’ flagship product in the marine market is the EASy Marine® modular LFP battery system. This system supports both hybrid vessels and fully electric ships. Its reputation in the industry stems from its safety, efficiency, and flexible design. Utilizing LFP cells, it offers exceptional safety—even in cases of short circuits, overcharging, or mechanical damage, there’s no risk of spontaneous combustion. More notably, EAS is participating in the EU’s “REFEST” project, aiming to develop an economical and viable hybrid solution for Europe’s fishing fleets while creating lighter, safer marine battery systems with higher recycling rates.
Lehmann Marine, headquartered in Seevetal-Hittfeld, Germany, has consistently focused on developing LFP battery systems for marine applications. Their CUBE series, renowned for its modularity, compactness, and safety, has secured certifications from multiple classification societies including BV, DNV, LR, and RINA. Consequently, it is widely deployed across various vessels—from fully electric ferries and fishery support ships to river passenger vessels. It’s worth noting that this series currently employs an air-cooled design. More intriguingly, their recent partnership with Greece’s Sunlight Group signals potential future annual production capacity expansion to 300 MWh. Furthermore, leveraging Sunlight’s global service network—including over 200 field engineers—will significantly enhance Lehmann Marine’s market reach and technical support capabilities.
This company is headquartered in the Netherlands but also has a branch in Germany. I believe Lithium Werks has consistently played a solid role in the marine lithium battery sector. Their systems cover nearly all core power requirements onboard, from main propulsion and electrical supply to emergency backup. While no particularly new market moves have been observed recently, their existing solutions are inherently robust, providing reliable support for shipping electrification. Therefore, if you’re seeking a comprehensive and stable marine lithium battery solution, including Lithium Werks in your considerations is indeed a solid choice.
I've worked in battery thermal management for over 5 years, handling lots of international projects. If you're curious about battery liquid cooling products or services, feel free to ask me any questions!
