Even 25 volts could kill

All safety precausions should be taken including the left hand in the back pocket to avoid accidental electric current circulation through the heart. First aids after an electric shock must be read, exercised. Even a few seconds delay can proove fatal. They are examples of persons surviving even after an 8 hour first aid breath support. A suitable fuse in series with a battery also helps preventing a fire hazard. Reference:Helliniki Radiophonia - Radio Karagianni Publications