Commercial AC voltage applied to an input terminal from a commercial power supply external to the vehicle is boosted by a transformer to a voltage level higher than the voltage of an electricity storage device to be applied to neutral points. The invention also relates to the apparatus for writing data blocks on a block addressable storage medium, preferably an optical storage medium, using defect management, with a host unit and a target unit. The invention proposes a drinking trough which is also suitable for young turkey chicks.