One plugin that really hammers your battery is Flash, so an easy way to save power is to stop Flash content from running automatically.
To do this click on the three vertical dots that are to the right of the address bar, and choose Settings. Alternatively type chrome://settings/ into the address bar and hit ENTER.
Next, click on the Show advanced settings… link, and then find the button marked Content settings … under Privacy.
Now under Flash you can choose to Block sites from running Flash altogether (adding any ones you can’t live without to the exceptions list).