Data processing device with at least two printed circuit boards, which are connected to each other and carry electronic components

The subject of the invention is a data processing device with at least two printed circuit boards (1, 2), which are connected to each other and carry electronic components, in one shelf. One of the pcbs holds a battery, which, if the operating voltage, which is derived from the mains voltage for both pcbs (1, 2), fails, provides currents which are at least suitable to maintain data in memories on the pcbs. In case the operating voltage fails, a device (15) is provided. This device is put into a defined state by a loading current, which is generated by the battery (11), for supporting capacitors (23) of the memories of the battery-less pcb (1). After the operating voltage returns, this state is maintained and established by the data processing device during a delay time.