They set the charging voltage low to be on the safe size for batteries in temps above 45C.
I also only see the SOC go up to about 83%. The charging voltage is set to 4.11v I’m pretty sure. It’ needs to be changed to 4.20V at least for the fuel gauge to go up to 100%.
There is code to do this but I have not attempted to change it yet.
I started a thread here about this: Changing Battery Charging Settings - Electron