Uses the unique power source inversion technology,causes the discharged battery energy automatically to invert the electrical network not to need the resis tive load;Electric discharge not heating element,durable,the reliability is high;Compares with the traditional test cabinet saves the energy for above tradition machine 90%, reduced the burden which the environment radiates.Uses in the nickel hydrogen,the nickel cadmium,the lithium ion battery sufficient electric discharge test,the capacity test,the sufficient flashover characteristic curve plan and the printing,the capacity minute chooses,the cycle life test.