Install ibam by entering the following commands in the terminal:
sudo apt update sudo apt install ibam
Description:
Advanced battery monitor for laptops
IBAM is an advanced battery monitor for laptops, which uses statistical and adaptive linear methods to provide accurate estimations of minutes of battery left or of the time needed until full recharge. It requires APM, ACPI or PMU.
Homepage: http://ibam.sourceforge.net/
Version: 1:0.5.2-2.1ubuntu2
Section: universe/utils