A crane assembly comprising a crane base arranged to be fixedly mounted to a vehicle, a column which is rotatably mounted to the crane base so as to be rotatable in relation to the crane base about an essentially vertical axis of rotation and a first actuator for rotating the column in relation to the crane base, the crane assembly further comprises a crane boom system comprising at least one liftable and lowerable crane boom (11, 13) which is articulately connected to the column and movable in relation to said column by at least one second actuator, the crane base comprises a support arrangement comprising a stabilizer beam and two stabilizer legs, wherein the two stabilizer legs are arranged to be extended from the stabilizer beam and set to ground during operation of the crane boom system to support the stability of the vehicle and crane assembly, said crane assembly further comprises a battery arrangement comprising at least one battery cell, and a battery circuitry unit provided with an electrical power take-off, and a battery mounting assembly structured to fixedly mount said battery arrangement to said crane base, wherein said battery mounting assembly comprises one bracket member adapted to the battery arrangement and provided with first attachment members to attach said battery arrangement, preferably via screws, to said bracket member, wherein said bracket member of the battery mounting assembly is further provided with second attachment members to attach said battery mounting assembly, preferably via screws, to the stabilizer beam, and wherein said battery arrangement is configured to electrically operate said first actuator and said at least one second actuator via said electrical power take-off, characterized in that said battery mounting assembly is fixedly mounted to said crane base only by being attached to said stabilizer beam by said second attachment members, and wherein said bracket member is arranged on said stabilizer beam such that a lateral side of said battery arrangement is aligned with an end of a slewing cylinder and also aligned with a vertical end surface of said stabilizer beam, and such that said battery arrangement is fixated on an upper side of said stabilizer beam. a battery mounting assembly structured to fixedly mount said battery arrangement to said crane base, wherein said battery mounting assembly comprises one bracket member adapted to the battery arrangement and provided with first attachment members to attach said battery arrangement, preferably via screws, to said bracket member, wherein said bracket member of the battery mounting assembly is further provided with second attachment members to attach said battery mounting assembly, preferably via screws, to the stabilizer beam, and wherein said battery arrangement is configured to electrically operate said first actuator and said at least one second actuator via said electrical power take-off, characterized in that said battery mounting assembly is fixedly mounted to said crane base only by being attached to said stabilizer beam by said second attachment members, and wherein said bracket member is arranged on said stabilizer beam such that a lateral side of said battery arrangement is aligned with an end of a slewing cylinder and also aligned with a vertical end surface of said stabilizer beam, and such that said battery arrangement is fixated on an upper side of said stabilizer beam.