WATTALPS joins the Maritime Battery Forum (MBF) to bring immersion-cooled battery technology to the future of maritime electrification
The Maritime Battery Forum (MBF) is thrilled to welcome WATTALPS, a French developer of advanced immersion-cooled battery systems, as its newest member. With its patented thermal management technology and growing focus on maritime applications, WATTALPS brings innovative solutions designed to improve battery safety, performance, efficiency, and lifecycle in hybrid and fully electric vessels.
WATTALPS’ entry into MBF strengthens the Forum’s collective expertise in next-generation battery technologies capable of supporting safer and more energy-efficient maritime operations.
Patented Immersion-Cooling Technology
Founded in 2018 as a spin-off from the French research center CEA, WATTALPS develops advanced lithium-ion battery systems based on its patented immersion-cooling technology. Headquartered near the French Alps, the company has rapidly established itself as an innovator in battery thermal management for demanding applications across mobility and industrial sectors.
WATTALPS batteries are certified according to Bureau Veritas Marine Type Approval, as well as international standards including UN R100 rev.5, IEC 62619, ISO 26262, and ASIL B/C. With seven patents and deployments across multiple industries, the company’s technology is designed to address some of the key challenges associated with high-performance battery systems.
Unlike conventional cooling methods, WATTALPS fully immerses battery cells within a dielectric cooling fluid combined with a patented circulation system. This enables exceptionally stable temperature control across all cells, significantly improving safety, reducing thermal stress, and optimizing battery performance and life.
The company states that this approach can increase battery performance by up to eight times, reduce battery system size by up to five times, enable ultra-fast charging, and extend battery lifespan significantly. For maritime applications, these gains can translate into lower vessel weight, reduced cooling infrastructure requirements, and improved overall energy efficiency.
From Research to Maritime Applications
WATTALPS’ connection to maritime batteries dates back more than a decade. The company’s CEO Matthieu Desbois-Renaudin first began working on immersion-cooled maritime battery systems in 2013 while at CEA, where he led an early project focused on large battery packs for offshore supply vessels.
As interest in immersion cooling grew, WATTALPS expanded into other sectors such as construction equipment and commercial vehicles. With the recent achievement of maritime certifications, the company is now fully positioned to support the marine industry with certified immersion-cooled battery systems specifically adapted to maritime operational requirements.
Current Maritime Projects
WATTALPS is currently engaged in several maritime battery projects spanning hybrid propulsion and fast-charging applications. Among its ongoing developments is a hybrid workboat project with K Challenge Lab, as well as hybrid fishing vessel projects in collaboration with Vectura Systems under the HYBA project. The company is also involved in additional hybrid and fast-charging vessel projects that remain confidential under non-disclosure agreements.
These projects reflect the increasing demand for battery systems capable of delivering high power, rapid charging, and improved thermal stability under challenging maritime operating conditions.
Integrating Safer, More Compact & Higher Performance Systems
WATTALPS sees the MBF as a valuable platform for exchanging knowledge, sharing operational experience, and building partnerships across the battery, shipbuilding, and maritime technology value chain. The company’s primary contribution to the MBF community lies in introducing immersion-cooling technology as a new approach to maritime battery system design. By improving thermal stability, reducing battery weight, extending lifecycle performance, and enabling faster charging, the company believes its technology can help accelerate the adoption of hybrid and electric vessels across multiple maritime segments.
Combined with its modular system architecture and certified solutions, WATTALPS aims to support shipyards and naval architects in integrating safer, more compact, and higher-performance battery systems into future vessel designs.
“We are excited to have joined the Maritime Battery Forum. Immersion cooling is a step ahead in maritime electrification and we look forward to bringing this technology to the ecosystem and developing new collaborations.
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About the Maritime Battery Forum
The Maritime Battery Forum was founded with the aim of promoting new and efficient energy storage technologies in the maritime industry. With over 90 members across 3 continents, the MBF works to disseminate information, facilitate discussion, and accelerate the journey towards a zero-emission maritime future.
Contact :
Ayomide Miracle Salifu
Community & Communications Manager
Email: ayomidesalifu@maritimebatteryforum.com
Website: www.maritimebatteryforum.com
