A film covered battery (1, 11, 21, 31) comprising: a battery element (5, 15, 25) having a first side and a second side in a thickness direction thereof, wherein said battery element is a laminate battery element which has a plurality of positive electrodes and a plurality of negative electrodes which are alternately laminated, and each of said positive electrodes and said negative electrodes comprises a tab (6a, 7a) protruding therefrom; a flexible casing (2, 12, 22) comprising two halves (2a, 12a, 22a; 2b, 12b, 22b) adapted to sandwich said battery element (5, 15, 25) from said first side and said second side in a thickness direction of said battery element (5, 15, 25) to seal said battery element (5, 15, 25) accommodated in an evacuated space between said two halves (2a, 12a, 22a; 2b, 12b, 22b) so that said casing (2, 12, 22) is in close contact with said battery element (5, 15, 25), one of said halves (2a, 12a, 22a) being cup-shaped and comprising a recess for receiving said battery element (5, 15, 25) on one side of said battery element (5, 15, 25); and a positive charge collector and a negative charge collector formed, respectively, by joining said tabs of said positive electrodes in said thickness direction and collectively joining said tabs of said negative electrodes in the thickness direction, lead terminals (3, 13, 23, 33) connected respectively to said positive charge collector of said positive electrode and said negative charge collector of said negative electrode of said battery element (5, 15, 25) and extending from said casing (2, 12, 22), and said film covered battery being characterised in that each said lead terminal (3, 13, 23, 33) is connected to said battery element (5, 15, 25) at a position between and parallel to said first side and said second side of said battery element (5, 15, 25) in the thickness direction thereof. a battery element (5, 15, 25) having a first side and a second side in a thickness direction thereof, wherein said battery element is a laminate battery element which has a plurality of positive electrodes and a plurality of negative electrodes which are alternately laminated, and each of said positive electrodes and said negative electrodes comprises a tab (6a, 7a) protruding therefrom; a flexible casing (2, 12, 22) comprising two halves (2a, 12a, 22a; 2b, 12b, 22b) adapted to sandwich said battery element (5, 15, 25) from said first side and said second side in a thickness direction of said battery element (5, 15, 25) to seal said battery element (5, 15, 25) accommodated in an evacuated space between said two halves (2a, 12a, 22a; 2b, 12b, 22b) so that said casing (2, 12, 22) is in close contact with said battery element (5, 15, 25), one of said halves (2a, 12a, 22a) being cup-shaped and comprising a recess for receiving said battery element (5, 15, 25) on one side of said battery element (5, 15, 25); and a positive charge collector and a negative charge collector formed, respectively, by joining said tabs of said positive electrodes in said thickness direction and collectively joining said tabs of said negative electrodes in the thickness direction, lead terminals (3, 13, 23, 33) connected respectively to said positive charge collector of said positive electrode and said negative charge collector of said negative electrode of said battery element (5, 15, 25) and extending from said casing (2, 12, 22), and said film covered battery being characterised in that each said lead terminal (3, 13, 23, 33) is connected to said battery element (5, 15, 25) at a position between and parallel to said first side and said second side of said battery element (5, 15, 25) in the thickness direction thereof.