NOVELTY - Composition (I) comprises: (a) a block copolymer including (i) at least one first polymer block having a final melting temperature, as measured by differential scanning calorimetry, of greater than 60 degrees C or a glass transition temperature, as measured by dynamic mechanical analysis according to ASTM E1640-99, of greater than 60 degrees C, and (ii) at least one polymer block including a polyalkoxide; and (b) a metal salt.    USE - (I) is useful as a polymeric electrolyte in a secondary battery (all claimed) for providing power to an electrical device e.g. mobile device, such as a cell phone, a vehicle (e.g. a vehicle having an electric engine), a portable device for recording or playing sound or images (e.g. a camera, a video camera, a portable music or video player such as a compact disk, cassette tape or MPEG layer-3 (MP3) playing device, a portable DVD player, a digital book or other wireless reading device), and a portable computer.    ADVANTAGE - The secondary battery is free of a porous separator. (I) has high electrical conductivity, a relatively high shear modulus, good processability, good mechanical characteristics, the physical state of a relatively cohesive mass, the ability to be readily handled without failure, efficient ion mobility, good electrical conductivity (e.g. ionic conductivity), a continuous flow path, a generally uniform distribution of multiple phases, relatively high durability, good ability to withstand the dynamic thermal conditions to which it will be exposed, or relatively good flame retardancy.    DETAILED DESCRIPTION - Composition (I) comprises: (a) a block copolymer including (i) at least one first polymer block having a final melting temperature, as measured by differential scanning calorimetry, of greater than 60 degrees C or a glass transition temperature, as measured by dynamic mechanical analysis according to ASTM E1640-99, of greater than 60 degrees C, and (ii) at least one polymer block including a polyalkoxide; and (b) a metal salt, where (I) exhibits a shear modulus (G'), as measured by dynamical mechanical analysis according to ASTM D5279-08 at 1 radian/second and 30 degrees C, and an electrical conductivity ( sigma ), as measured by alternating current impedance spectroscopy in a Solartron using an alternating current amplitude of 10 mV at 30 degrees C, such that G'- sigma is greater than 200 (S/cm)(dynes/cm2); and G' is 104-1010 dynes/cm2. An INDEPENDENT CLAIM is included for preparing the block copolymer of (I), comprising: mixing a linear copolymer containing at least 3 wt.% of a first monomer having a carboxylic acid group and at least 60 wt.% of a second monomer, which is ethylene and propylene, a polyalkoxide containing ethylene oxide and/or propylene oxide and having one functional group which is reactive with the carboxylic acid, and optionally solvents; and reacting the functional group of the polyalkoxide with the carboxylic acid group of the linear polymer to form a block copolymer having at least one polyalkoxide block grafted onto the linear copolymer, where the block copolymer contains at least 5 wt.% of alkoxide groups.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the secondary battery cell having a separator.    Secondary battery cell (10)    Anode (12)    Cathode (14)    Separator (16)    Metal current collectors. (20)