As compared to windows battery consumption in Ubuntu is double.

Device - Dell Inspiron 3521

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    You might try latest kernel and latest Mesa to see if it'd make any difference. – Hi-Angel Jun 13 '17 at 10:55
  • There are many battery saving techniques in Ubuntu and Linux in general. Just "google it". – WinEunuuchs2Unix Feb 18 '18 at 20:41

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
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    I checked it is showing, all processes are normal. Windows gives double battery backup than Ubuntu. – Alamjit Singh Jun 25 '17 at 18:36
  • @AlamjitSingh did you try to alter some settings in the tunables tab? – Sethos II Jun 26 '17 at 9:19

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