There is a known issue on the 8000 Series Hybrid NVRs where these alerts may be generated by mistake.
To determine if the alert is real (signifying the NiCd battery pack is defective), remove the power cable from the recorder. If the battery is defective, the recorder will shut down abrutly. If this is the case, replace the NiCd battery pack.
If the recorder continues to operate and performs a graceful shutdown, the battery alert was generated by mistake. Download the following patch from our Resource Center and apply it to your affected 8000 Series Hybrid NVR.
Patch #: 34184_rev2-0_RawFiles