Hybrid vehicles use high voltage batteries and electric motors for power. The batteries generate quite a shock.
Most consumers and technicians are not cognizant of the amount of power. The voltage can range from 144 volts on a Honda Civic to 500 volts on a Toyota Prius so the battery can pack quite a wallop. Therefore, there is more than enough juice to fry anyone who accidentally comes into contact with the high voltage battery, wiring or power equipment components used in hybrid vehicles.
The recommended protection for technicians who service these vehicles is to wear Class 0 rated rubber insulated gloves, which are rated up to 1,000 volts AC. These gloves should be free of any tears, pinholes, or cuts and certified since they have a shelf-life. See this link for Hybrid Vehicle Gloves.
Also, you must make sure the vehicle is turned OFF before you begin any electrical or mechanical repairs on any hybrid power components.