NOVELTY - A battery comprises a positive electrode (11); a negative electrode (12); and an electrolyte including a fluidic electrolyte in which an electrolytic solution containing a solvent and an electrolyte salt is present while maintaining fluidity, and a non-fluidic electrolyte in which an electrolytic solution containing a solvent and an electrolyte salt is supported by a polymeric material.    USE - As battery in battery pack, electronic apparatus, electrically driven vehicle, electrical storage device, and electric power system (claimed). The electronic apparatus includes portable electronic apparatuses such as camera-integrated Video Tape Recorder (VTRs), cellular phone, and notebook PCs.    ADVANTAGE - The device comprising the battery exhibits reduction in size, weight, and thickness, and a longer operational lifespan. The battery is light in weight, can obtain a high energy density; exhibits improved battery characteristics; and exhibits improved output characteristic and a cycle characteristic. The battery exhibits improved battery characteristic in long-term use, or use in a high-temperature environment or a low-temperature environment.    DETAILED DESCRIPTION - A battery comprises a positive electrode (11); a negative electrode (12); and an electrolyte including a fluidic electrolyte in which an electrolytic solution containing a solvent and an electrolyte salt is present while maintaining fluidity, and a non-fluidic electrolyte in which an electrolytic solution containing a solvent and an electrolyte salt is supported by a polymeric material. The non-fluidic electrolyte is present between the positive electrode and the negative electrode, and the fluidic electrolyte is present at least in a void inside active material layers of the positive electrode and the negative electrode. The fluidic electrolyte is present between the positive electrode and the negative electrode. A porous separator (13) is interposed between the positive electrode and the negative electrode, and the non-fluidic electrolyte is present between at least one of the positive electrode and the negative electrode, and the separator. INDEPENDENT CLAIMS are included for the following:    (1) a battery pack comprising: the battery; a control unit that controls the battery; and an exterior package (5) in which the battery is accommodated;    (2) an electronic apparatus comprising: the battery, where electric power is supplied from the battery;    (3) an electrically driven vehicle comprising: the battery; a conversion device to which electric power is supplied from the battery and which converts the electric power to a driving force of a vehicle; and a control device that performs an information processing related to a vehicle control on the basis of information about the battery;    (4) an electrical storage device comprising: the battery, where the electrical storage device supplies electric power to an electronic apparatus that is connected to the battery. The electrical storage device further comprises an electric power information control device that transmits and receives a signal to and from other apparatuses via a network, where a charge and discharge control of the battery is performed on the basis of information that is received by the electric power information control device; and    (5) an electric power system, where electric power is supplied from the battery or the electric power is supplied to the battery from a generator or a power network.    DESCRIPTION OF DRAWING(S) - The figure shows exploded perspective view illustrating a configuration of laminated film type battery using a laminated electrode body.    Positive electrode lead (2)    Negative electrode lead (3)    Adhesive film (4)    Exterior packaging member (5)    Laminated electrode body (10)    Rectangular positive electrode (11)    Rectangular negative electrode (12)    Separator (13)    Fixing member (14)