Librem 5 battery life on
#postmarketOS (5.9.16-librem5.2), day 1:

Unplugged and switched on at 8:45am. Now (4:30pm) it's at 4%.
I used it quite a bit for social media browsing, email and XMPP (@dino) + Matrix (#nheko) in the beginning and during lunch break (which took about ~1h); mobile data worked fine. Even watched a video for a few minutes. Wifi was turned off when not needed.

While this is not super impressive, as I did not use the phone a ton, it's definitely a good start.