Rohde & Schwarz DVS SpycerBox Flex, Hardware Manual

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Overview
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2.4 Battery Backup Unit
To prevent data loss especially for the metadata, the hard disks of the
system disk array (see section “System Disk Array” on page 2-12) are
protected by a battery backup unit. If the system’s operation gets inter-
rupted, for example, in case of a power failure, it will provide power to
the cache of the connected RAID controller, so that buffered data will
not get lost. Once the operation of the system is restored, the cached
data will be written to the hard disks.
The battery backup unit is located inside the casing of the DVS system:
Figure 2-16: Location of battery backup unit inside the system
The battery backup unit is a rechargeable battery that will be charged
automatically when the system is turned on.