Abstract: A battery box includes a rectangular box body to hold a battery, and a rectangular top cover fastened to the box body by fasteners, the box body having curved horizontal flanges vertically spaced at one side and provided with rubber pads for supporting on an oxygen cylinder being carried on the shoulder; the top cover having two long side bottom edges curved outwards and attached to two opposite long sides of the box body at the top, and two short side bottom edges curved inwards and attached to two opposite short sides of the body body at the top, and two opposite contact metal springs on the inside respectively connected to the two electrical input terminals of an external search light by a cord, the contact metal springs being respectively connected to the two opposite terminals of the battery when the top cover is closed, causing the search light to be electrically connected to the battery.