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Libreboot – HP EliteBook 820 G2 support added to Libreboot!
(libreboot.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Here is a detailed review about this laptop: https://www.notebookcheck.net/HP-EliteBook-820-G2-Subnotebook-Review.144671.0.html
It's from 2015, there is a full HD screen version. IIRC there was a big performance step between intel 4th and 5th gen, this laptop is 5th gen. You can still buy new batteries for this model.