no thermal runaway issues with these at all . we have some lab tests were they over charged the cells to twice their nominal voltage . cells continued to function . a regular lead battery would probably explode if you overcharged it that much . the battery as configured is rated up to 16.8v so its not even close to its maximum .

as far as heat they are rated and tested to 55c so about 131 degrees , shouldn't be a problem

p.s. i live in s.Florida so they see lots of heat .