I am only doing web browing on Chrome, average around 4-5 hrs....
There's your answer.
Chrome is the worst browser available on OS X, it's a massive resource hog and power drain.
true, but I found its folder & tag functions quite useful and can't really surf without it....
where as safari only has bookmark etc.
I'm getting an average of 3.5 to 4.5 hours on my Late 2013 Retina MacBook Pro - using just Safari and enabling power saving graphics switching. I didn't expect Apple to be accurate about the 9 hours, but less than half of that is pathetic.
Edit: how ironic... my Mac just popped up a Low Battery notice while I was typing this.
Have you checked Energy Usage in the Activity Monitor to see what is using most other than Safari?
Of course. Only Safari was listed. It's not like I was rendering 3D animations or editing multiple 4K movies in the background. I get this pathetic 4 hour battery life just with basic browsing.
...and Reading List plus many add-ons to manage browsing, maybe worth another look, even if only for when you need max battery life.