I don't understand why people put the zapper on different parts of their body when originally it was supposed to be held in each hand. I thought holding it in each hand while tapping would make it pulse through the whole body. Since my first use of the zapper, I've felt movements, tingling and twitching at random points throughout my body. Now I hardly feel anything and thought it wasn't working, but let a friend use it and she really felt it, so I know it still works. I guess there is nothing wromg with experimenting. Although I wouldn't experiment with bigger and biggher batteries.