A non-aqueous electrolyte secondary battery comprising an enclosure in which two kinds of positive electrodes having a positive electrode active material; a non-aqueous electrolyte; a negative electrode containing a titanium compound as a main component of a negative electrode active material in a content of 50% by mass or more, relative to the entire negative electrode active material; and a separator disposed between one of the positive electrodes and the negative electrode and formed from an electrical insulating material are enclosed, which comprises a negative electrode which is held by the separator from both sides thereof and is disposed between one of the positive electrodes and the other one of the positive electrode adjacent thereto, and wherein the two kinds of the positive electrodes include a first positive electrode containing a layered rock salt compound as a positive electrode active material, and a second positive electrode containing as a main component, a positive electrode active material different in kind from the layered rock salt compound, the positive electrode active material contained in the second positive electrode being one compound selected from the group consisting of: lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, lithium nickel cobalt manganese composite oxide, spinel type lithium manganate, and lithium phosphorus oxide having an olivine structure; the non-aqueous electrode secondary battery further comprises terminals connected individually to the first positive electrode, the second positive electrode, and the negative electrode and having a terminal-extending part which extends outward from the enclosure; the terminal-extending part of the terminal connected to the first positive electrode exists apart from the terminal-extending part of the terminal connected to the second positive electrode; and the first positive electrode being characterized in that it is continuously electrically insulated such that it is not discharged by connection to at least an external load except for self-discharge during the discharge of the non-aqueous electrolyte secondary battery, in that it is maintained in the enclosure, and in that its state-of-charge is 10 % or more and 100 % or less, wherein the state-of-charge is determined as described in the specification. two kinds of positive electrodes having a positive electrode active material; a non-aqueous electrolyte; a negative electrode containing a titanium compound as a main component of a negative electrode active material in a content of 50% by mass or more, relative to the entire negative electrode active material; and a separator disposed between one of the positive electrodes and the negative electrode and formed from an electrical insulating material are enclosed, which comprises a negative electrode which is held by the separator from both sides thereof and is disposed between one of the positive electrodes and the other one of the positive electrode adjacent thereto, and wherein the two kinds of the positive electrodes include a first positive electrode containing a layered rock salt compound as a positive electrode active material, and a second positive electrode containing as a main component, a positive electrode active material different in kind from the layered rock salt compound, the positive electrode active material contained in the second positive electrode being one compound selected from the group consisting of: lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, lithium nickel cobalt manganese composite oxide, spinel type lithium manganate, and lithium phosphorus oxide having an olivine structure; the non-aqueous electrode secondary battery further comprises terminals connected individually to the first positive electrode, the second positive electrode, and the negative electrode and having a terminal-extending part which extends outward from the enclosure; the terminal-extending part of the terminal connected to the first positive electrode exists apart from the terminal-extending part of the terminal connected to the second positive electrode; and the first positive electrode being characterized in that it is continuously electrically insulated such that it is not discharged by connection to at least an external load except for self-discharge during the discharge of the non-aqueous electrolyte secondary battery, in that it is maintained in the enclosure, and in that its state-of-charge is 10 % or more and 100 % or less, wherein the state-of-charge is determined as described in the specification.