The RTC (CMOS) battery is shown on page 18 of the maintenance and service manual. It's on the front left system board between the heat sink/fan and the speaker assembly when the system is fully assembled and you look at the keyboard.
The directions to replace the CMOS battery are on page 53 (pae 62 of the PDF) of the service manual. Use the procedures on previous pages to get to the final step. You'll need to turn off the laptop and disconnect all external devices. Next, remove the back cover (shown on page 32) and remove the system battery. Then remove the 4 Philips screws and remove the system board. Disconnect the RTC clock battery cable from the system board and pry the battery out of socket. Do this carefully and replace the battery with a matching coin cell battery. Make sure to maintain the correct orientation. If you break the socket or wiring, you'd have to replace it with HP part 702853-001 .
The documentation for the Elitebook 820 G3 is available on the product support page: https://support.hp.com/us-en/product/hp-elitebook-820-g3-notebook-pc/7815289/manuals . The current link to the service manual is http://h10032.www1.hp.com/ctg/Manual/c04887199 .
I hope this helps.
Cindy Wells
SOURCE: CMOS
The cmos on the Pavilion is going to be in one of three places, and will be one of two styles of battery. The cmos style will be either a large watch type battery about the size of a nickle located in a slot on the mother board, or in a yellow or greenish pouch with two wires leading to a connector, located under a cover on the bottom of the machine, or under the keyboard.
SOURCE: CMOS Battery location on samsung vm8000
cmos battery is underneath. Take off fan cover. remove fan screws x 4. Then lift black cloth on right hand side. You will see the offender. Lift the battery from the left hand side gently with a small flat head screw driver....
SOURCE: Dell Inspiron 1000 notebook - where is the CMOS battery located
underneath the keyboard, pull the top plastic line cover (the one covering the power button) then two screws and pull it off carefully, the ribbon connection will pull out pretty easy but be carefull not to twist it.
SOURCE: Where is the location of the Cmos battery for my
You really need a service manual to try & locate the CMOS battery. With laptops the CMOS battery can be different on each model. These are often located on the motherboard below the keyboard, but a service manual should help you.
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