Im a bit confused about Lipo

Are the same as the old ib's4200 for being volitile? If so surely its a health and safety issue that they shouldnt be used until people know that they are safe and reliable.
Surely they must of been tested for safety by the manufacturer before being released to the general public, for which is they are used in the correct way then should occur no problems.
Like i said i no naff all about them, tho they seem like a good idea but if what i see on here about them blowing up surely someone is gonna get hurt. Which could leave any club in dire straits.