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OP>> Battery life is going to be all over the place on the Yosemite beta. Just erase it and go back to Mavericks if you want good battery life.
OP-->As said above.
You can´t expect to get quoted battery life when using beta software.
When i tried out the public beta i got between 4-5 hours of battery life with no cpu intensive tasks(safari, pages and numbers) before it was drained.
 
your battery usage is 14.4 watts so you can calculate how much battery life you have based on your batteries Wh rating and current draw. Just a small obvious tidbit. This was you can watch as you close apps or fix the power draw and do a quick calculation without having to wait for the battery meter to update.
 
Gaming on an air?? On a beta???
1:45 is expected while gaming. Let alone, the graphics drivers in yosemite are totally out of wack. I had to go back to Mavericks because of how laggy dota 2 was on yosemite.
 
Did a fresh install of mavericks. Kernel_task is still on 20%

How much time have you given kernel_task to adjust to the new clean install?
Have you rebooted since?

And what if you just use the damn machine and see where it actually leads you instead of watching the battery time indicator?
 
And what if you just use the damn machine and see where it actually leads you instead of watching the battery time indicator?

The battery time indicator is notoriously variable and unreliable. As noted above it just uses some sort of algorithm to estimate battery time to empty.

You just need to use the machine and see how it performs. You are also correct the the initial indexing, which can take a considerable period of time, depending on how much you have on your SSD, also uses CPU and battery. It took me several days for it to settle down.

On my 2012 MBA running ML, I would routinely get 6+ hours of actual use on a charge-- easily enough for a cross country plane ride. It is almost double that on my 2013 running Mav. Amazing! The 2012 wasn't bad and should be better on Mav than ML, but never tested that.
 
How much time have you given kernel_task to adjust to the new clean install?
Have you rebooted since?

And what if you just use the damn machine and see where it actually leads you instead of watching the battery time indicator?

Read the thread again. I already ran my "damn machine" without worrying and i got 4 hours of browsing.

its now on 108% and indexing is done

3 hours battery on 77%
 

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