KennyG
Elite Member
198 people in the US die every year by licking 9volt batteries to see if they are good.
It can't happen with normal alkaline batteries because the battery internal resistance is too high. They can't discharge fast enough across skin resistance, even with a wet surface.
Rechargeables are more dangerous, but not because of shock. They have a much lower internal resistance so, when they are shorted, they can generate lots of heat. I've cut plastic with a couple of AA NiMH batteries and a piece of wire from a toaster. If you carry rechargeables in your pocket and accidently short them out, you can start a fire in your pants.