As compared to windows battery consumption in Ubuntu is double.
Device - Dell Inspiron 3521
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up.Sign up to join this community
You can check what consumes a lot of power with
powertop (must be run as root/with sudo). The program has a tab called tunables (switch with Tab) where you can toggle several settings (Toggle with Space). Watch the power consumption before and after on the overview tab and check if everything still works as expected. These settings are reset after a reboot.
There is also a utility called
laptop-mode-tools which automatically switches most tuneables to a powersaving mode when you run on battery.
Both are in the standard repositories, so you can add them with apt:
sudo apt-get install powertop laptop-mode-tools