TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The box body is provided with the battery mounting cavity. The anode terminal and/or the cathode terminal are provided with the insulating sleeves. The battery support is mounted in the battery mounting cavity. The batteries combination body comprises four 3.2 V of lithium batteries connected in series, which are parallel. The lithium ion battery has the lithium iron phosphate lithium ion battery structure. The gap is formed between two adjacent lithium ion batteries, where at least a support cushion is mounted in each gap and a waterproof mechanism is mounted between the box body and the cover body. The waterproof mechanism comprises a waterproof groove arranged on the top part of the box body and a waterproof convex strip arranged on the bottom of the cover body, and matched with the waterproof groove, where the waterproof convex strip is located in the waterproof groove. The battery support comprises four frame bodies, where each frame body comprises a four-layered straight triangular prism cavity. The bottom surface of the cavity have right triangle shape, where the four layers of cavities are overlapped in each frame body and an inlet is arranged in each cavity. The inlet is opposite to the right angle of the right triangle of the bottom surface of the cavity, where four corners of each lithium ion battery are mounted in four cavities located on the same heights of four frame bodies. The four clamp grooves are mounted on the inner wall of the battery mounting cavity, where four clamp grooves are matched with four frame bodies and four frame bodies are clamped in four clamp grooves. The two opposite inner walls of the battery mounting cavity are provided with two first convex strips, which are extended from the bottom of the battery mounting cavity to the top part. The first convex strip is bent on the terminal of the convex direction to form four clamp grooves, which are matched with the frame body. The other two opposite inner walls of the battery mounting cavity are provided with two columns, which are extended from the bottom of the inner wall of the battery mounting cavity to the top part, where at least one of the two columns is provided with the second convex strip extended along the axial direction. The second convex strip is bent on the terminal of the convex direction to form two limit convex strips matched with the frame body. The clamp groove and the limit convex strips are fixed on the frame body. The lithium ion storage batteries comprise a bottom supporter. The bottom supporter is fixed on the bottom of the box body, where the bottom of the box body is provided with several locating bumps and the locating bumps are ejected on the battery supports. The anode terminal and the cathode terminal are injected on the convex body, where one end of the positive lead is fixed on the anode terminal through a screw and one end of the negative lead is fixed on the cathode terminal through screw. The four lithium batteries of the batteries combination body are flat rectangular, where the four lithium ion batteries are arranged in an overlapping manner. The lithium ion storage batteries comprise a sealing ring matched with the waterproof groove, where the sealing ring is mounted in the waterproof groove of the box body. The lithium ion storage batteries also comprise several fixing screws. The screw through hole matched with the fixing screw is arranged in the box body. The screw through hole is vertical to the bottom surface of the box body. The upper end of the screw through hole is located on the top part of the box body. The lower end of the screw through hole is located on the bottom of the box body. The bottom end of the box body is provided with the screw blind hole matched with the screw through hole. The cover body is fixed on the box body through the fixing screw. The fixing screw perforates the screw through hole and the screw blind hole. The screw through hole is located on the center of the column and perforates the whole column along the axial direction. The line threading groove is arranged in the battery mounting cavity of the box body. The line threading groove is matched with the positive lead and the negative lead. The positive lead and the negative lead are located in the line threading groove, where the four lithium ion batteries of the cell combination are connected in series through an adapter plate or a connecting line. The bottom of the box body is provided with a fixing frame, where the fixing frame heightens the battery support and the fixing frame is shaft-shaped, cross-shaped or parallel-shaped. The balance circuit is arranged in the box body or the box body. The balance circuit is connected to the batteries combination body through a connecting flat cable. The frame body is a straight triangular prism, where two adjacent frame bodies are connected through reinforcing ribs and/or an adhesive tape. The lithium ion storage batteries comprise a right-angled side of the straight triangular prism close to the inner wall of the box body. The lithium ion storage batteries comprises a bottom supporter with its one face provided with a fixing hole, where the other opposite face is provided with the bottom supporter foot. The bottom supporter foot is fixed with the fixing hole of the external bottom of the box body. The adjacent bottom supporters are connected through the bottom supporter foot and the fixing hole located on the bottom supporter.