# description
Battery storage device extending StorageDevice. All properties are u2demo extensions unless inherited from SAREF-aligned StorageDeviceDM.

# allOf[].properties.target_soc.description
Target state of charge (fraction). No direct SAREF property, kept as u2demo extension.

# allOf[].properties.time_target_soc.description
Deadline to reach the target SoC (u2demo extension).