Hello again, After upgrading BIOS to 1.16.0 the issue is now gone. Battery stops charging at the custom level set in BIOS, as expected.
Hello, As stated on the subject, after installing BIOS update 1.15.1 custom charging intervals are being ignored. Battery keeps charging up to 100%, even though my custom intervals are 50% min. - 75% max. Up to BIOS version 1.14.0 it was working as expected. At first I thought it was a software issue, after installing a couple Linux kernel upgrades (my OS is Ubuntu 20.04 LTS, from factory). But I tried different kernel versions (different OS on another drive) and confirmed it is not related.
BIOS battery charge limits ignored after BIOS update to 1.15.1 (Vostro 15 3510)