GeoVision GV-AS2120 IP Control Panel - Manual (Page 199)

Optional Devices
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9.2.4.C Connecting Backup Battery
You can connect any 12 V battery to GV-ASNet to provide backup power when the main
power supply fails. When the main power supply is removed and the battery voltage level is
above 10.2V, the battery will support normal operation of the GV-ASNet.
Black Red
12 V Battery
Figure 9-12