Visit the dell xps 13 9360 driver page filter operating system to Ubuntu 16.04 and then install Dell Command | Configure Application by following the instructions there.

sudo /opt/dell/dcc/cctk --primarybatterycfg=custom:50-85

problem

openssl: /opt/dell/dcc/libcrypto.so.3: version `OPENSSL_3.0.3' not found (required by openssl)

solution here