NOVELTY - Non-aqueous electrolyte battery (I) comprises a case, a positive electrode held in the case, a negative electrode held in the case, and including a negative active material which undergoes lithium insertion/release at a potential higher than 1 V, and a non-aqueous electrolyte packed in the case, where the non-aqueous electrolyte comprises a non-aqueous solvent, an electrolyte material dissolved in the non-aqueous solvent, compound containing at least a pyridine repeating unit (A1) or (A2), and compound having one or more silanyl functional groups (A3).    USE - (I) is useful in battery assembly (claimed).    ADVANTAGE - (I) inhibits self-discharge without changing resistance even when the negative electrode employs a material having a high lithium insertion/release potential. (I) has excellent high-temperature characteristics and has a long life. (I) is lightweight, has a high output and excellent long-term reliability.    DETAILED DESCRIPTION - Non-aqueous electrolyte battery (I) comprises a case, a positive electrode held in the case, a negative electrode held in the case and including a negative active material which undergoes lithium insertion/release at a potential higher than 1 V, and a non-aqueous electrolyte packed in the case, where the non-aqueous electrolyte comprises a non-aqueous solvent, an electrolyte material dissolved in the non-aqueous solvent, at least one compound containing at least a pyridine repeating unit of formula (A1) or (A2), and at least one compound having one or more silanyl functional groups of formula (-Si(R1)(R2)(R3)) (A3).    R1-R3 = 1-10C alkyl, 2-10C alkenyl or 6-10C aryl.    An INDEPENDENT CLAIM is included for a battery assembly (23) comprising (I) connected together in an electrically serial or parallel arrangement.    DESCRIPTION OF DRAWING(S) - The figure shows an exploded slant view of a battery pack.    Battery assembly (23)    Printed wiring board (24)    Protective circuit (26)    Protective sheet (36)    Container. (37)