YES ... I have had a battery go 'POP' on me ... but I was recycling individual Ni-cad batteries from junk cellphone batteries, usually only one battery which make up the pack is faulty, the rest are good,, and using an ordinary car battery charger, it has 6v/12v options ... plus I had forgotten about the charge and it went pop across the room. as the case of one battery broke open
The manuals of just about everything you buy these days starts with about ten pages of do not do this and that as they strive to protect themselves from claims .. such is the litigious society we live in.