SHANGHAI, Sept. 3, 2026 /PRNewswire/ -- APsystems has reached a major safety milestone for its commercial and industrial (C&I) energy storage portfolio. Under the witness of TÜV Rheinland, the APstorage 261L liquid-cooled storage solution successfully passed the rigorous UL 9540A fire propagation test, demonstrating exceptional fire safety performance. During testing, thermal runaway was fully contained within a single cabinet, with no propagation to adjacent units, exceeding industry-standard safety requirements.