The Immersio CTP system eliminates module boxes and outer enclosures to fit more power into vessels navigating zero-emission rules. It delivers roughly 200 watt-hours per kilogram, surpassing market leader Corvus Energy's 168 Wh/kg by 19 percent, falling short of earlier marketing claims comparing it to lithium iron phosphate units. Safety questions also persist because the high-nickel cells are prone to thermal runaway and the surrounding coolant remains flammable. Furthermore, maritime certifier DNV has not yet approved the design, leaving the technology unproven in commercial fleet operations.
Key points
Shipowners seeking compliance with European emissions mandates lack verified sea trial da…: Shipowners seeking compliance with European emissions mandates lack verified sea trial data for this new marine battery.
Certifications from maritime safety authorities like DNV are still pending before broad c…: Certifications from maritime safety authorities like DNV are still pending before broad commercial adoption can take place.
Independent verification remains unavailable because Xing Mobility has not publicly relea…: Independent verification remains unavailable because Xing Mobility has not publicly released its full testing results under safety standards.
Sources checked by our analysis pipeline: 1
Electric ships are a modest business. Most estimates put the global market at under US $5 billion in 2025. But the business is growing, and it is drawing more battery makers. The latest is Xing Mobility, of Taoyuan City, Taiwan. In September, at the SMM Hamburg maritime trade fair, it unveiled its Immersio CTP pack. The pack submerges every cell in a fluid that absorbs heat without conducting electricity but is, notably, flammable.
Xing is not the first to pursue that idea. Kreisel Electric, of Rainbach im Mühlkreis, Austria, won certification for an immersion-cooled marine battery pack in 2023. Its batteries are now powering the P-12 hydrofoil ferry built by Candela, of Stockholm. Wattalps, of Moirans, France, received an approval for its marine batteries in January 2026 from Bureau Veritas, of Neuilly-sur-Seine, France. Xing’s pitch is density. The company says its CTP stores up to twice the energy of conventional marine batteries. It also says its immersion scheme keeps one overheating cell from igniting the rest.
Those claims rest mostly on laboratory data. Only two vessels run on Xing packs,…
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