This post from @dos will answer your question: Battery life too short (noob) - #8 by dos. Also, I’m not very familiar with the bq25895 documentation yet you’d want to go over it because of: It's a burning phone - #30 by dos. Another correct (important to be understood) post is here: USB-DCP-5V-1.5A protocol and Librem 5 - #2 by dos.
Yes (inserted battery related fine tuning) and as it is long time ago that I recall seeing 99%, although red LED light off, this one should help seeing (getting) 100% there:
P.S. @pi-rp, I’ll leave you now on your own 
(with hope that this short wraparound/intro helps).