Global battery energy storage manufacturer HiTHIUM has unveiled its new ∞Power Flexsso battery energy storage system (BESS) at its first trade fair appearance in Italy, marking a significant step in the company’s European expansion.
The product was introduced at KEY – The Energy Transition Expo, held in Rimini, where the company publicly displayed the 10-foot ∞Power Flexsso 3.125MWh/6.25MWh four-hour BESS container for the first time. The system has been designed specifically to support the deployment of energy storage projects in markets where road transport weight restrictions create logistical challenges.
According to HiTHIUM, the modular energy storage solution is engineered to balance high energy density with simplified transport and installation. Each unit weighs under 26 tons, allowing it to comply with common road freight standards and enabling easier transportation without requiring disassembly. The company said the system’s factory-preassembled modules can also reduce installation time and on-site labor requirements, ultimately lowering the total cost of ownership for project developers.
The Flexsso solution is expected to benefit regions where infrastructure limitations or transport regulations complicate the delivery of large-scale energy storage systems. Its compact design allows developers to deploy battery storage more efficiently in transport-constrained and space-limited environments.
At the event, HiTHIUM also highlighted its growing position in the global energy storage market. According to industry assessments from InfoLink Consulting, the company ranked among the top two battery energy storage system providers worldwide in 2025 for both total battery shipments and utility-scale energy storage shipments.
Speaking at the expo, Kelson Li said the company’s entry into the Italian market reflects its strategy to strengthen its presence across Europe as energy systems continue to evolve toward large-scale storage integration.
HiTHIUM also showcased results from an extreme fire safety test conducted on its 6.25MWh energy storage system. The test was performed in accordance with updated safety standards including UL9540A:2025 and NFPA 855:2026.
The open-door test was monitored by safety experts from UL Solutions and fire protection engineers. Unlike conventional closed-door tests, the system was intentionally exposed to high oxygen levels to increase combustion intensity, while active fire suppression mechanisms were disabled to evaluate the effectiveness of passive safety features.
According to the company’s report, the test demonstrated that thermal propagation was successfully contained within the affected unit, while neighboring containers remained within safe temperature thresholds.
HiTHIUM said the innovations showcased at the expo highlight the growing importance of safety, adaptability, and logistical efficiency as battery energy storage becomes a key component of the global energy transition.
