I once ....ummm , no I always use a lighter to check the water in the battery cells . BANG !!! , it sounded like a shot gun , I rinsed the left eye for about 5 minutes an ambulance showed up but I refused and walked to emerg. because it was only a block away . apparently it was a very dry cell so it was just 100s of little powder holes which would heal in a week . When I arrived home to look at the battery it had exploded mostly into the fender well and the rest blew past my head just brazing it but of course I now know a battery cell explodes quicker than one can blink and I still use a lighter to check the cells .

okay you can bash away now but I survived

ya it's a true story

Ya see, I knew you had some Alberta redneck in you.