UL Solutions: Thermal Runaway Testing for Battery Enclosures At a recent webinar (28/09/22), UL Solutions presented its methods for testing the thermal runaway and fire safety of battery enclosure materials. These include the Torch and Grit (TaG) test and the Battery Enclosure Thermal Runaway (BETR) test that has been in use for the past several months. UL Solutions: Thermal Runaway Testing for Battery Enclosures