Have you tried another browser? Chrome has notoriously TERRIBLE effects on battery life on Macs.

I'm not kidding. Try Safari for two days and be amazed.

There are probably things you can do to make it better, but for whatever reason Google doesn't seem to care and ships (what I would say is effectively) broken software.

Exactly this. Open up your battery menu, it will say Chrome is using significant energy. I've never not seen it there

Gee, maybe it's because you have a million tabs open, and all of them are websites with shitty, wasteful javascript begging the CPU for useless operations to update every single tracking pixel and cookie, with up-to-the-minute anaylitics, attached to sessions that are years old, on how your eyes move over their ad banners, so that a genetic machine learning algorithm can determine which ads are most likely to convert to clicks and then sales.

Hint: It's the ad for the top 7 ways you didn't know you could get bunions, and there's a 50% chance it will convince you to buy new shoes.

You are being downvoted, I assume for your "over the top" tone, but your overall message is very good. User behavior is the largest determinant of battery life.

I run Firefox with NoScript, and my battery usage is always very very good. An additional benefit is that I see few ads, since they invariably rely on third-party javascript.

89% charged, 4h calculated time http://replycam.com/i/batterylifetime_1BE12F3F.png (but in reality, it will be shorter)

yeah, chrome is in there.

but switch to safari? my thoughts a) i'm a developer, i rather like new APIs, latest HTML 5 features b) my whole company infrastructure relies on google services (and they work best in chrome, no surprise there) c) my old macbook air (2013, maverick, killed one month ago by my son with self made kombucha) had about 7h battery-life

I'm not arguing you should switch to Safari (which I like) or arguing feature merits (I don't care much myself). But if you have a Mac you have Safari, so it's an easy test to run. And you will be AMAZED at the difference in battery life. It's pathetic.

Agreed. I stopped using Chrome at home. It was weird moving to Safari but I get much longer battery life now.

To be fair that's not super useful information - I've never not seen Safari there when it's being used. Definitely agree that Chrome is way worse in practice though.

I'm not saying Safari is 'free', I'm saying that Chrome's battery use is very disproportionately high.

Chrome also turns on the discrete GPU for seemingly no reason.

Matters for machines that have them (like mine) but even in integrated only machines it makes a huge dent in battery life.

I don't know about the MB Retina, but I get more than the advertised 9 hours on my rMBP 15" running Word and Outlook.

Your problem is probably Chrome + screen brightness. Recommended monitor brightness in an office setting is 100-150 cd/m^2. The MB gets up to 375 cd/m^2 for outside use, but inside it should be at like a 35% setting. Also, Chrome guzzles juice like there is no tomorrow--use Safari.

It would be nice if they added a per app power usage tracking feature like they have on iOS to isolate such culprits. But yes, Chrome is the worst in battery and CPU usage.

I'm pretty sure Activity Monitor had per-app power usage tracking before iOS.

thanks for reminding me.

Take a look at the Energy pane of the Activity Monitor sometime.

Chrome on the Mac is very tough on the battery.

A switch to Safari increased my battery life by about 80%.

about the energy pane http://replycam.com/i/Pasted_Image_28_10_15_17_38_1BE13189.p... what does the Avg Energy Impact number actually mean i.e.: what unit is it?

That does seem rather short – most reviews of the 12" Macbook seemed to indicate that 8h was an achievable runtime.

I hear that Chrome sucks up battery like nothing else though; might be worth investigating whether Safari's improved power usage is worth the tradeoff in other aspects?

That would be because you're using chrome, not Safari. I have the same machine and I get 8-10 hrs, easy (and I bought it the day it was released).

Chrome is terrible for batteries.

Chrome has long been known to kill battery life, hence most Mac users sticking with Safari

I don't know anybody who uses Safari, and everyone I know is a Mac user.

Agree. I see when details when I click on battery life. Apps using significant energy - Chrome.