Replacing The Button Cell Battery - Honeywell HUS-NVR-1032/6032-E User Manual

Basic Operations

Replacing the Button Cell Battery

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It is recommended that the Lithium batteries should be replaced with the same battery type.
To ensure the accuracy of the system time, replace the Lithium battery every two years.
Replace the battery when the NVR is powered off and then reset the system time after
restarting it.