Check how much watts of power battery consuming every second

$ sudo apt-get install powerstat
$ powerstat -d 1

And check watts option how much power consuming every second.

Now install TLP

$ sudo add-apt-repository ppa:linrunner/tlp
$ sudo apt-get update
$ sudo apt-get install tlp tlp-rdw smartmontools ethtool

Now start TLP. Note: You have to run this command only once, it will start automatically whenever system reboot or start

$ sudo tlp start

Check TLP status whether it is enable or disable

$ sudo tlp-stat

You see something like
+++ System Status
TLP power save = enabled
power source   = ac

Again check powerstat -d 1 and see the difference. Before power consumption and new power consumption.