The invention relates to a protective helmet, in particular a protective motorcycle helmet, comprising an outer shell (1) for distributing impact forces, a battery socket (2), which is firmly connected to the outer shell (1), for detachably accommodating a battery (3), and a line assembly (4), which is electrically connected to the battery socket (2), for supplying electricity by means of the accommodated battery (3) to an electric apparatus (5) which is mechanically coupled to the outer shell (1).