NOVELTY - A non-aqueous electrolyte secondary battery has positive electrode (11), negative electrode (12) and non-aqueous electrolyte (14) having lithium ion conductivity. The positive electrode contains lithium containing transition metal oxide (I). The negative electrode contains negative electrode active material excluding metallic lithium. The battery is charged such that the electric potential of the positive electrode is 4.4-4.6 V(vs.Li/Li cation), and is activated.    USE - Non-aqueous electrolyte secondary battery. Uses include but not limited to mobile telephone, camcorder, notebook computer and electric vehicle.    ADVANTAGE - The non-aqueous electrolyte secondary battery is inexpensive and has improved discharge characteristics, by using lithium containing transition metal oxide as positive electrode active material.    DETAILED DESCRIPTION - A non-aqueous electrolyte secondary battery has positive electrode, negative electrode and non-aqueous electrolyte having lithium ion conductivity. The positive electrode contains lithium containing transition metal oxide of formula (I): Li1+xNiaMnbMcO2+d as positive electrode active material. The negative electrode contains negative electrode active material excluding metallic lithium. The battery is charged such that the electric potential of the positive electrode is 4.4-4.6 V(vs.Li/Li cation), and is activated.    M=Na, K, B, F, Mg, Aluminum, Ti, Cr, V, Fe, Cu, Zn, Nb, Mo, Zr, Sn, or W;    c=0-0.05;    d=-0.1 to 0.1;    x=more than 0 and 0.1 or less;    a/b=0.7-1.3;and    x+a+b+c=1.    An INDEPENDENT CLAIM is included for manufacture of non-aqueous electrolyte secondary battery, which involves charging and activating the battery having the positive electrode, negative electrode and non-aqueous electrolyte such that the electric potential of the positive electrode is 4.4-4.6 V(vs.Li/Li cation).    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic explanatory drawing of cell used for testing positive electrode.    Positive electrode (11)    Negative electrode (12)    Reference pole (13)    Non-aqueous electrolyte (14)