Battery information inside terminal
To check your battery details in the terminal, use upower and create an alias for it.
This is a helpful hack if you want to trigger events on low battery, or if you use a minimal desktop environment without a battery indicator.
The upower command gives battery stats:
upower -i /org/freedesktop/UPower/devices/battery_BAT0
Grep for the details you need:
upower -i /org/freedesktop/UPower/devices/battery_BAT0 | grep -E "state|time|per"
Create an alias; after this you can run the command using the alias bat:
alias bat='upower -i /org/freedesktop/UPower/devices/battery_BAT0 | grep -E "state|time|per"'
Add the alias to ~/.bashrc or ~/.zshrc to make it permanent.