@Skalman I haven’t got a single issue that you have. Calls are great, nobody complained as for now, data is working fine, as far as I can see, and battery percentage is normal.
As other stated, try to reinsert battery, it might help with calibration.
For the call quality, it might be that your sound settings are off.
Try running
sudo rm -rf /var/lib/alsa/librem5*.state ~/.config/pulse
And reboot your phone.
This will erase your current sound settings, and on reboot, default ones will be created.