Manufacturer's first appearance at KEY marked company's expo debut in Italy
HiTHIUM displayed new 10-foot Flexsso container for first time publicly
Company presented results of first ever open-door fire test
Rimini, Italy, March 5, 2026 — Leading battery energy storage manufacturer HiTHIUM has expanded its presence in Italy with its first Italian trade fair appearance, at Key - The Energy Transition Expo in Rimini, Italy. At the Expo, HiTHIUM revealed publicly for the first time its 10-foot ∞Power Flexsso 3.125MWh/6.25MWh 4hr BESS, which was engineered to support reliable deployment of energy storage projects in regions with road transport weight constraints. The product's design addresses logistical challenges faced by developers in markets where road transport weight limits affect project delivery. The manufacturer also presented the results of the first open-door fire test of an energy storage container, sharing video footage of the test itself.
Modular BESS designed for transport-constrained markets
HiTHIUM's 10-foot ∞Power Flexsso BESS addresses challenges faced by developers in regions where road transport weight limits can affect project delivery. Its modular architecture balances high energy density with simplified logistics, enabling more flexible deployment across diverse project locations.
With each unit weighing under 26 tons, the container aligns with common road freight standards and can support standard road transport configurations in many regions. This reduces the need for disassembly and helps simplify logistics planning. The modules are factory-preassembled to decrease installation time and on-site labour as well, lowering the total cost of ownership. The Flexsso thus facilitates energy storage deployment in space-constrained and transport-challenged markets with practical logistics and installation innovations that improve project timelines.
2025 global rankings put HiTHIUM in top 2
HiTHIUM VP Europe Kelson Li provided further context for the company's focus on Italy: "Our Italian debut comes on the heels of 2025 global industry assessments, including from InfoLink, that ranked Hithium as one of the top two BESS companies worldwide. This was in two key categories, for energy storage battery shipments overall and utility-scale battery shipments. We also broke ground in Europe by shipping the industry's first ever 6,25MWh 4-hour BESS here. As energy systems evolve, scale alone is no longer enough; innovation, safety, and adaptability must move forward together."
On the manufacturer's innovations, Li said, "Both the ∞Power Flexsso and our new ∞Power 6,25 MWh long-duration energy storage system are especially relevant for Italian project developers. The 6,25 MWh product's design has cut maintenance time in half, and its lifespan aligns with PV systems. Importantly for more densely populated markets like Italy, it also operates quietly and has exceptional new safety features. In fact, we've been able to share extraordinary results here, from the fire test conducted on the 6,25 MWh BESS."
Extreme fire test: Passed
At Key - The Energy Transition Expo, the HiTHIUM team unveiled and discussed the results of the major fire test it conducted to comply with the new, authoritative standards of UL9540A:2025 as well as the National Fire Protection Association's (NFPA) 855:2026. The new certifications provided a thorough upgrade to the testing and evaluation methods for battery energy storage thermal runaway fire propagation.
The fire was overseen by independent supervisors from U.S. safety and sustainability expert UL Solutions, along with fire protection engineers, according to HiTHIUM's initial report. Unlike typical closed-door testing, the test was configured to create the highest possible oxygen supply and increase combustion intensity. The 6,25MWh BESS's active fire suppression systems were disabled, so as to scrutinize the effectiveness of its passive safety design features. The results, in brief: thermal propagation was contained to the single unit where the fire was started, while cell temperatures in neighbouring containers did not rise above the safety threshold.
