I cant see how 9v dc can shock you aside touching the leads with tongue... or using any step up electronics. As a kid we used to test batteries voltage with th

I cant see how 9v dc can shock you aside touching the leads with tongue... or using any step up electronics. As a kid we used to test batteries voltage with the tongue, 9V had a distinctive bite, compared to 4.5V. Even today I can tell the output voltage of a multimeter (in its ohm mode)