DVR Date & Time Automatically Reset

if you are facing problem with your DVR , and it automatically reset date & time to 12’O clock and date to its manufacturing year, then probably the mobo battery is dead,
In DVR same lithium battery is used as in desktop/laptop computers, it keeps your DVR time & date up to date even when switched off, you have to replace that battery, most like normal CR3220 cell is used,
in some DVR’s its easy to take out the cell just like Desktop PC, but some DVR’s have embeded the connectors inside motherboard, and only experienced technician can replace the battery for you.
and you have to open up the DVR case and take out the main board because sometimes battery is placed upside down, here in the image below i am showing battery of a AVtech DVR which i repaired few months ago,