Equipment for testing battery of electric device

An equipment for testing a battery set of an electric motor vehicle that has an electric motor and a plurality of wheels, at least one of the wheels being connected to be driven by the motor, said equipment being connected between the battery set and the electric motor and comprising a microcomputer main unit, an analog/digital converter, a decoder, at least one set of voltage testing lines, at least one relay, an analog switch, and a display;

• wherein said one set of voltage testing lines is connected with two terminals of a battery of the battery set for measuring a terminal voltage of the battery;
• wherein said analog switch is used to measure a discharge current of the battery;
• wherein said analog/digital converter is used to transmit said terminal voltage of the battery and said discharge current to said microcomputer main unit;
• wherein one of said relays is selected by said microcomputer main unit via said decoder to retrieve a terminal voltage datum of the battery of the battery set whereby said terminal voltage datum is used by said microcomputer main unit to compare and compute a residual characteristic value, which is exhibited by said display, wherein a residual range is obtained using a residual storage capacity, the discharge current, the motor rotation speed and the radius of the at least one of the wheels.