Many years ago I had a VW beetle with a dodgy starter battery,
couldn't be bothered removing the back seat to access the battery
( this is where they are to be found on old Beetles bizarrely)
So I disconnected the live battery terminal then connected the charger leads
to charge overnight,so far so good.....................................got up in the morning and
took off the charger leads then started to attach the live battery terminal,the spanner
then touched the seat rail and the live terminal...................................................the resultant bang
was like a bomb going off

It blew the battery apart and showered my hand in battery acid
I went out and bought a new battery after that little incident
