The Ford Motor Company has released an emergency response guide for their Escape Hybrid vehicle. Like most (if not all) other hybrid vehicles, the main concern is the high voltage battery cells.
The Escape has 250 individual, 1.3 volt, Ni-MH (Nickel-Metal Hydride) cells (similar in shape to a size D flashlight battery). Each individual battery cell is contained in a stainless steel case. The cells are welded and wrapped together in groups of 5 to form a module. There are 50 modules in the battery pack (located in the rear of the vehicle – inside the rear hatch, underneath the carpeting) with a total voltage of the battery pack in excess of 300 volts DC.