Mavericks MacBook Air 2013 Battery Draining

Yes,

I don't think Chris in on Mavericks.

Hopefully whoever it was, will continue to work their magic into the future.

Kind Regards

Steven

i am on mavericks. i know the 20 Hours arent realistic, the indicator is changing very quick. Just wanted to share the picture with you guys. in my opinion battery life got worse with mavericks.

Cool.

It's an awesome screenshot for bragging. 😀

Here's how i fixed the issue on my air 2013 8gb ram 13in: I reset smc 2x then PRAM. I booted up normally and deleted the sleepimage file- it regenerated itself and I'm good to go. Let me know if all this works for you.

How do you delete the sleepimage file?

type this: sudo rm /private/var/vm/sleepimage this requires admin priviliges to do in terminal. This file has been known to become as large as 20gb, and it recreates itself (I performed a little more research and found out). The sleepimage is what keeps track of what you are doing before you sleep your computer, so you can get out of sleep with all your programs and info untouched. The file just expands and expands, recording the whole time you use the computer so it needs to be deleted so it can start fresh with no info inside the file.

I think I may have been successful. Now, is there a reason to disable hibernate mode?

this command doesn't disable it! it just will delete the file, and regenerate it on it's own! and if you are trying to disable hibernate mode, that belongs on another thread- and btw can you click question answered on the correct post

@macmacma...

"The file just expands and expands, recording the whole time you use the computer so it needs to be deleted so it can start fresh with no info inside the file."

NO. Until Mavericks, this file is as big as the Ram and just a copy of the complete Ram, 8GB of Ram means a sleepimage file of 8GB, and so on (it overwrites every time).

In Mavericks the handling of Ram is different completely, and much more efficient; and the sleepimage file is much smaller than the physical Ram, say about 1-2 GB.

@Redactor

If you do not need a hibernatemode that writes a sleepimage (for example when you have a SSD) to save shutdown and startup time, then you should not mess around with it; and in Mavericks there is not much to win, as I said above.

But note that in Mavericks it is more complex than just setting the hibernatemode to 0 and deleting the sleepimage file: this writing of the sleepimage comes back even after setting the hibernatemode to 0. You also have to create a zero size sleepimage and then lock it to make it impossible to overwrite, so that the effect is that there is always a zero size sleepimage.

Thanks macmac,

seems to me your hint has worked.

sudo rm /private/var/vm/sleepimage

I experienced the same problem so that's what i did! 🙂 Hard to believe a simple command can fix a huge problem! Anyhow, enjoy and like the posts that helped!

@computeruser25 and @macmacma...

No this did not help at all. But important is that your issue has gone (but not by deleting the sleepimage, read my post).

happy rest of the year.

🙂

Lex

Hello!

As requested I started a new thread and here is my link:

https://discussions.apple.com/thread/5654125

Please take a look at my system and let me know if you can help me with this battery drain issue after upgrading to Mavericks! I am probably doing something wrong somewhere in this cybermachine 🙂

Thanks!

Alright I am back to where I came from. Fast drainin battery. Did you solve the problem?

I have been complaining but kept quiet (still reading). I took a note on the sleep image - thinking that there could be some sort of background indexing. I did not remove it, let it rebuilt by the system, but I did disk repair thinking it could be some bad index pointer (again, this is a '09 MacBook pro, sort of old), each time I restarted with SMC and - gasp! - installed Onyx for 3rd party treat and even ran it.

Now, yet another 3rd party, Coconut is telling me this (saved the history).

I have been using my laptop on battery for about an hour now, it says 83% and 4:03 hrs remaining (Mail is open).

this is not true but so long the 2-3 I had before Mav I think this key is patience. Still, I would like to pass this info to some Apple expert, perhaps they could clarify what may be wrong, that (1) fixed now or (2) does not appear.

I have not yet tested whether the % indicator is accurate, beforehand it simply stopped at 65% and shut down. I will let you know what happened.

And, let me add, as far as anyone citing the need for the discussion thread, may there be one, but the original premise of each of these was (and has always been) the battery.

Nothing else. Those were the derailed arguments, not these (this is a nod to tut, I feel your pain).