Q: Battery draining fast - after Mac OS Sierra update

Is this problem restricted to just Mac's - anyone else seeing similar issues with iOS devices?  I'm fighting both battles. 

Old rule - let the computer or device run all the way down, then when you get the warning it is about to shut down - plug it in and fully charge it in one sitting.  I have found repeating 2 or 3 times seems to work better for some devices.  Also, keep an eye when the device is recharging - if its fully charged within 20 or 30 minutes, that clearly is a power management issue.  If it takes an hour or longer, the batter is truly drained.  You may then have a runaway process taxing the CPU (explains the device getting hot).  Also keep in mind, once older than 3 to 4 years for a Mac, and 2 years for a iPhone/iPad, battery issues could be due to an old battery. 

Worse thing you can do is leave the Mac laptop plugged in say 85% of the time, then once or twice a week unplug it to go to the coffee shop.  They really are not designed to be plugged in all the time.  Being charged continuously will also age a battery. 

There is also rebuilding from scratch - that definitely improves battery performance on iPhone/iPad, but can also on Mac's.  Its a little bit more involved process than doing the automatic overlay update, but most anyone able to follow instructions can do it.  

Sorry, but you clearly have absolutely no idea what you're talking about!  

I have a MB Air. Everytime I use Safari the fan starts running. Activity Monitor shows it is Safari and whatever website I'm on as the energy hogs. As soon as I quit Safari, I hear the fan reduce until it is off. I'll abandon Safari once again. How long have browsers existed for one to still be this bad?

In response to Trond-Clueless:

Really? Well your answer certainly doesn't make you sound like you have been using Apple products and certainly not system architecture design with them for 30 years. It sounds more like you're just another end user with some tinkering experience. If you really knew what you were talking about, you'd provide a more detailed answer.

And let's not forget that many of us are using machines well over 4 years old, so your theory doesn't hold up about the batteries.

How about sticking to the actual topic at hand instead of trying to sound smart when you're clearly not!

Activity Monitor shows kernel_task with a high CPU% on my Mac since I installed Sierra

In Activity Monitor->View->All Processes Hierarchically, it looks like window_server is the culprit:

So, what could be causing window_server to run at this high a cpu% ?

After upgrade battery dry very fast also performance too bad. I look at activity monitor, nothing suspicious.

MacPro battery was last 7-8 hours now just 2-3 hours.

If i open my development ide taking more time to open simple file.

I am thinking revert back, but due to my project schedule and server ssh key, more pain ......

Same issue, the activity monitor changes a lot, sometimes it says it is chrome, others Kernel_task, and others secd. The battery has dropped from 98% to 89% in less than 5 minutes. crazy.

I have a mac book air that came with mavericks and didn't upgraded to el capitán bc of its bad reviews. I guess I should have waited longer to upgrade to Sierra.

Please fix this asap, I'm writing final assignments and this is incredibly disappointing.

I've had this problem as well since upgrading to Sierra. I now constantly have Activity Monitor open, checking both CPU and avg energy. Chrome is the usually at the top of both lists but closing that out doesn't translate to extended battery life. The other disappointing thing is that battery seems to drain when the lid is closed. I use to get 0 - 5% drain with closed lid for a day or more before upgrading. Now, with the lid closed, I can expect the drain to be in the ballpark as normal use with the lid open.

Can anyone from Apple give us a solution ?

i am feeling like i am talking with the Moon !!

Can i use a Time Machine backup to revert on Capitan ?

same problem. wait for the 10.12.1 update.

OKay, I found a solution and it worked like a charm.

My laptop is now running El Capitan again and none of the prior problems are there (no battery drain and not over heating).

It DOES require a hard disk erase, but once the El Capitan is downloaded and installed, your compu will run normally again.

DO make a Time machine backup or make sure you've saved important items to the cloud or an external device.

Here's the link to the solution:

http://www.macworld.co.uk/how-to/mac-software/how-downgrade-from-macOS-sierra-el -capitan-remove-macos-sierra-3581872/

Before you start, DO go to the comments section FIRST!!!

There is a piece of code you need to use, the article author missed one syntax, so some users posted the correct one.

You will need approximately 2 hours to make the change, depending on your system.

Yes.

Any ideea for the release date ?