I’ve read where a 9volt battery can kill you by interfering with heart rhythms, one finger of your left hand on one button and one finger of your right hand on the other. The electricity passes from your left through your heart to the right.
Your skin has too much resistance for this; the current would not penetrate the epidermis. When you check a battery with your tongue the shock is from the short across the conducting outer wet, salty surface. If you used conducting needles through the dermis on both terminals and there was a path through the heart it might approach the threshold to trigger an arrhythmia (~50-100 mA I think), but very unlikely.
Have to admit that is not something I’ve had heard before.
But I suppose there would have been a warning on the Duracell if it was a immediate danger, but I’m going to have to remember to be a bit more careful around those now.
My boat was driven up on the shore in a storm by the waves. I tried to disconnect the battery that was totally submerged in salt water. It lit me up so bad, I just let it be. I’ve been shocked a lot before, but nothing like that.
I was almost killed by a 9 volt battery once. I stuck it on my aunt’s German Shepherd’s nose.