Safety Alert on E-cigarettes

The Standard P&I Club have raised a safety alert on e-cigarettes:
And you thought that e-cigarettes were safer than tobacco??

The US Navy banned e-cigs on ships for this reason, had a few incidents of battery explosions(generally it was sailors being dumb and fucking with stuff they shouldn’t have been.)

I am on a Navy hybrid ship now. Banned on Navy and MSC ships. Despite the ban, they are still in use.