TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Pack: The battery pack further comprises a protective circuit, which detects a voltage of each of the nonaqueous electrolyte batteries. Preferred Components: The specific surface area (Sp) of the positive electrode layer is of 0.1 - 2 m2/g. The specific surface area (Sn) of the negative electrode layer is of 5 - 50 m2/g. The specific surface area ratio (Sn/Sp) is of 10 - 80. The thickness ratio (Lp/Ln) is of 0.6 - 0.9. The thickness Lp of the positive electrode layer and the thickness Ln of the negative electrode layer is of 5 - 150 microns. The negative electrode active material is formed of particles having an average particle diameter of not greater than 1 microns. The negative electrode comprises a negative electrode current collector supporting the negative electrode layer. The nonaqueous electrolyte contains lithium salt in a concentration 1.5 - 2.5 mol/l.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The negative electrode active material includes a titanium-containing metal composite oxide. The titanium-containing metal composite oxide includes lithium-titanium oxide having a spinel structure.    TECHNOLOGY FOCUS - METALLURGY - Preferred Components: The metal compound is of formula LiaNibCocMndO2 and the thickness ratio (Lp/Ln) is of 0.7 - 0.9. The titanium-containing metal composite oxide contains at least one element selected from phosphorus (P), vanadium (V), tin (Sn), copper (Cu), nickel (Ni) and iron (Fe). The negative electrode current collector is formed of an aluminum foil or an aluminum alloy foil. Each of the aluminum foil and the aluminum alloy foil has an average crystal grain size not greater than 50 microns.a=0 - 1.1;andb+c+d=1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The nonaqueous electrolyte comprises at least two kinds of nonaqueous solvent selected from propylene carbonate, ethylene carbonate, diethyl carbonate and gamma-butyrolactone. EXAMPLE - A positive electrode active material of a lithium-nickel-cobalt-manganese composite oxide represented by LiNi1/3Co1/3Mn1/3O2, having a lamellar structure and having an average particle diameter of 3 microns, was prepared. Then, added to the positive electrode active material were a graphite powder, in an amount of 8 wt.% based on the amount of the positive electrode, and a PVdF, which was used as a binder in an amount of 5 wt.% based on the amount of the positive electrode. The resultant mixture was dispersed in n-methylpyrrolidone (NMP) used as a solvent so as to prepare slurry. Then, both surfaces of an aluminum alloy foil having a purity of 99%, having a thickness of 15 microns and having an average crystal grain size of 10 microns were coated with the resultant slurry, followed by drying the coated slurry and, then, pressing the aluminum alloy foil having the both surfaces coated with the slurry so as to obtain a positive electrode having the dried slurry coated on the both surfaces. The dried slurry, which constituted the positive electrode layer and formed on one surface of the aluminum alloy foil was found to have a thickness (Lp) of 43 microns. The positive electrode was found to have an electrode density of 3 g/cm3. The specific surface area (Sp) of the positive electrode layer as determined by the BET method was found to be 0.5 m2/g. Mixed were a powder of lithium titanate represented by Li4Ti5O12, having a spinel structure, and having an average particle diameter of 0.3 microns, a coke powder having an average particle diameter of 0.4 microns, an acetylene black, and PVdF used as a binder in a mixing ratio by weight of 90:6:2:2. The Spinel type lithium titanate powder was found to have a BET specific surface area of 15 m2/g, and a lithium ion insertion potential of 1.55 V (versus Li/Li+). Also, the coke powder was found to have a BET specific surface area of 50 m2/g. The mixture thus obtained was dispersed in NMP, and the resultant dispersion was stirred to obtain slurry. Then, an aluminum foil having a purity of 99.99%, having a thickness of 10 microns, and having an average crystal grain size of 10 microns was coated with the slurry thus obtained, followed by drying the coated slurry and, then, subjecting the aluminum foil coated with the dried slurry to a hot press process so as to obtain a negative electrode. The negative electrode thus obtained was found to have the slurry coating amount of 13 mg/cm2 on one surface, the thickness (Ln) of the negative electrode layer on one surface was 59 microns, and an electrode density of 2.2 g/cm3. The porosity of the negative electrode excluding the current collector was found to be 35%. Also, the BET specific surface area Sn of the negative electrode layer was found to be 10 m2/g. As pointed out above, the thickness Ln of the negative electrode layer on one surface was 59 microns. On the other hand, the thickness Lp of the positive electrode layer on one surface was 43 microns. It followed that the ratio Lp/Ln of the battery was 0.729. The positive electrode was covered with a separator formed of a polyethylene porous film having a thickness of 12 microns, and the negative electrode was disposed to face the positive electrode with the separator interposed between them, thereby forming a laminate structure. The laminate structure thus formed was spirally wound so as to obtain an electrode group, which was further pressed so as to mold the electrode group in a flattened shape. The flattened electrode group was housed in a case formed of an aluminum foil-containing laminate film having a thickness of 0.1 mm. A liquid nonaqueous electrolyte was prepared by dissolving lithium tetrafluoro borate (LiBF4) in a concentration of 2 mol/l in a mixed solvent prepared by mixing ethylene carbonate (EC) and gamma-butyrolactone (BGL) at a mixing ratio by volume of 25:75. The liquid nonaqueous electrolyte thus prepared was poured into the electrode group housed in the case so as to obtain a flattened type nonaqueous electrolyte battery (test) and having a thickness of 3.8 mm, a width of 35 mm and a height of 63 mm. A flattened type comparative nonaqueous electrolyte battery was manufactured in similar manner as test battery, except that LiCoO2 was used as the positive electrode active material, that a mesophase-based carbon fiber was used as the negative electrode active material, and having Lp of 23 microns, Sp of 2.5 m2/g, Ln of 65 microns, Sn of 1, thickness ratio (Lp/Ln) of 0.39, the specific surface area ratio (Sn/Sp) of 0.4, and the lithium salt concentration of 1 mol/l. The resultant test/comparative nonaqueous electrolyte batteries had discharge capacity (at -30degreesC) (mAh); discharge capacity retention ratio (at -30degreesC) (%); and cycle life (at -30degreesC) (times) of 600/250, 90/30 and 1500/80 respectively.