Method for battery replacement in a vehicle, which vehicle is equipped with a storage space (150;200;300;400) for a battery (120,122;220;320;420;620), wherein an opening (151;204;304;404) into the storage space is arranged under the vehicle, wherein a battery installed in the storage space is arranged to be used to propel the vehicle, wherein the following steps are performed: a) the vehicle is caused to assume a first predetermined position in relation to a first transport device, arranged at least partly above ground and beside the first predetermined position, for automatic transport of a first battery out and away from the vehicle; b) the first transport device is caused to bring the first battery out and away from the vehicle along a first path running from the storage space, under a beam of the vehicle and up to a position above ground and beside the vehicle; c) the vehicle is caused to assume a second predetermined position, which may be the same as the first predetermined position, in relation to a second transport device, which may be the same as the first transport device and which is arranged at least partly above ground and beside the second predetermined position, for automatic transport of a second battery up to and into the vehicle; and d) the second transport device is caused to bring the second battery up to and into the vehicle along a second path running from a position above ground and beside the vehicle, under a beam of the vehicle and up to the storage space; wherein, in step b), a hinged door (210;310;410;510), arranged at the underside of the vehicle so that it in a closed position covers the opening, is opened downwards, whereby a part of the first battery, which in this position at least partly is supported by a support surface (213;313;413;505) of the door, becomes available to an engagement device (240;340) of the first transport device, and wherein the first engagement device thereafter in step b) engages with or supports the first battery and brings the first battery along the support surface of the door, in a direction with a non-zero horizontal component, away from the storage space and thereafter away from the vehicle along the said first path, c h a r a c t e r i s e d i n that the first and second transport devices (130,140) are both installed in such a way so that they act in relation to the vehicle from a position located at a side of the vehicle, in that the said beams are side beams of the vehicle, and in that both the first and second paths (121,123) each comprises, as seen from the storage space (150;200;300;400), a respective partly downwards directed part and an essentially horizontally directed part running out from below the vehicle towards said respective position above ground. a) the vehicle is caused to assume a first predetermined position in relation to a first transport device, arranged at least partly above ground and beside the first predetermined position, for automatic transport of a first battery out and away from the vehicle; b) the first transport device is caused to bring the first battery out and away from the vehicle along a first path running from the storage space, under a beam of the vehicle and up to a position above ground and beside the vehicle; c) the vehicle is caused to assume a second predetermined position, which may be the same as the first predetermined position, in relation to a second transport device, which may be the same as the first transport device and which is arranged at least partly above ground and beside the second predetermined position, for automatic transport of a second battery up to and into the vehicle; and d) the second transport device is caused to bring the second battery up to and into the vehicle along a second path running from a position above ground and beside the vehicle, under a beam of the vehicle and up to the storage space; wherein, in step b), a hinged door (210;310;410;510), arranged at the underside of the vehicle so that it in a closed position covers the opening, is opened downwards, whereby a part of the first battery, which in this position at least partly is supported by a support surface (213;313;413;505) of the door, becomes available to an engagement device (240;340) of the first transport device, and wherein the first engagement device thereafter in step b) engages with or supports the first battery and brings the first battery along the support surface of the door, in a direction with a non-zero horizontal component, away from the storage space and thereafter away from the vehicle along the said first path, c h a r a c t e r i s e d i n that the first and second transport devices (130,140) are both installed in such a way so that they act in relation to the vehicle from a position located at a side of the vehicle, in that the said beams are side beams of the vehicle, and in that both the first and second paths (121,123) each comprises, as seen from the storage space (150;200;300;400), a respective partly downwards directed part and an essentially horizontally directed part running out from below the vehicle towards said respective position above ground.