UL Standards free download UL 9540A-2017 pdf download – Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems UL 9540A-2017 pdf download - Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems. 5 General 5.1 Cell 5.1.1 The general cell design shall be documented in the test report, which would include... 02-10 Download Now