J52
An expert Paul Christiansen is talking now on Radio 4 and he thinks there should be some concern and checks on vale batteries.
He also mentioned that unless handled appropriately in the home they were unstable, more so if they’ve been bought illegally.
If bought from a reputable manufacturer, they make it quite clear what to do and not to do re safety.
But some people refuse in their stupidity to follow these instructions - for example, they will use charging cables that are not designed specifically for the equipment - because they are cheap. Also, they might 'streamline' their vaping equipment to get more 'input', thus running the risk of overhearing the battery... they charge their devices on the carpet / bed / propped up on a cushion - leave them charging for too long which degrades the 'separator' in the battery (which will more than likely cause it to combust). The list is endless.
I've been vaping for a long time and follow all the recommendations and instructions to the letter. And never buy anything 'on the cheap', only from recognised outlets.