Battery (1) for storing electric energy, at least comprising a spherical core (2) comprising a first material, a spherical separator (4) surrounding the spherical core (2), and a shell (6) covering the spherical separator (4), wherein the shell (6) comprises a second material different from the first material, wherein at least one first contact terminal (8) extends at least partially shielded from the spherical core (2) through the separator (4) and the shell (6) to the outside and wherein at least one second contact terminal (10) is formed at an outer surface of the shell (6).