Rimini, Italy, March 5, 2026 – HiTHIUM, a leading manufacturer of battery energy storage systems, made its first appearance at an Italian trade fair this week, exhibiting at Key – The Energy Transition Expo in Rimini. The company used the occasion to publicly unveil its 10-foot ∞Power Flexsso 3.125MWh/6.25MWh 4-hour BESS—a system specifically engineered to support reliable energy storage deployment in regions where road transport weight limits pose a serious logistical hurdle. By addressing these constraints head-on, the product helps developers avoid delivery delays and simplify project execution. HiTHIUM also shared footage from what it says is the industry’s first open-door fire test on an energy storage container, offering rare transparency into its safety validation process.
The ∞Power Flexsso is HiTHIUM’s answer to a persistent problem: how to deploy high-capacity storage in places where road weight limits make conventional solutions impractical. Its modular design strikes a balance between energy density and logistics—each unit weighs under 26 tons, making it compatible with common road freight standards across many regions. That means less disassembly, simpler transport planning, and ultimately more flexibility in project siting.
The system also arrives factory-preassembled, which cuts down on installation time and on-site labor—lowering total cost of ownership in the process. For developers working in space-limited or infrastructure-constrained markets, the Flexsso offers a way forward that doesn’t compromise on performance or timelines.
Kelson Li, VP Europe at HiTHIUM, framed the company’s Italian debut in the context of broader industry momentum: “Our arrival in Italy follows global assessments from firms like InfoLink, which ranked HiTHIUM among the top two BESS providers worldwide—both in overall battery shipments and utility-scale categories. We also made European history by shipping the industry’s first 6.25MWh 4-hour BESS here. As energy systems grow more complex, scale isn’t enough. Innovation, safety, and adaptability have to advance together.”
Li went on to explain how the company’s latest products speak directly to Italian project needs: “Both the ∞Power Flexsso and our new ∞Power 6.25MWh long-duration system are highly relevant for local developers. The 6.25MWh product cuts maintenance time in half and offers a lifespan that aligns with PV systems. It’s also quieter and built with enhanced safety features—important considerations for more densely populated markets like Italy. And we’ve backed that up with results from a fire test that pushed the system to its limits.”
At the expo, HiTHIUM walked attendees through the results of a major fire test conducted in line with the updated UL9540A:2025 standard and NFPA 855:2026 requirements—both of which introduce more rigorous methods for evaluating thermal runaway and fire propagation in battery storage systems.
The test was monitored by independent observers from UL Solutions and fire protection engineers. In a departure from conventional closed-door setups, the test was configured to maximize oxygen flow and combustion intensity. The system’s active fire suppression was deliberately disabled to test the strength of its passive safety design. The outcome? Thermal propagation was contained entirely within the unit where the fire was ignited. Neighboring cells stayed below critical temperature thresholds—proof, the company says, that its safety architecture holds up even under extreme conditions.
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