Mountain lion 10.8.2 battery life is worse !

You move the installer to a thumb drive or other media and boot into the options table which I believe is Holding down Command and R. Than you choose install OS from Disc or drive or whatever. The only problem and Im glad I saved the installer, is that you will undoubtably lose all your data and settings, correct me if Im wrong? Major annoyance and I dont have adequate external storage for a backup. These are not things one should have to worry about when following prompts and instructions from a company that's main sales point is that you dont have to continuously monkey around to get things right. Major hassle and disappointment. I would think they would do better testing of the software before pushing it out for update prompts.

Count me in as another 13" MBP (mid-2011) that has about half the battery life I started with. I was already concerned that my capacity fell off quickly in the first year of ownership but now with the 10.8.2 upgrade I've gone from 7 hrs when new, to 5 hrs under lion (with 84% original capacity) to now less than 4 hours under Mountain Lion.

Apple, do you do any testing of your OS upgrades? Please fix this.

Have any of you noticed much greater battery drain when your MBP's are in sleep mode? My 2011 MBP 13-inch on SL would lose about 3% of the battery charge at night when I would put it to sleep. With mountain lion, I see nearly 8-9% battery drain for the same duration. There's no power-nap on my machine either.

I can understand the higher battery drain when the machine is running, but when sleeping??? This is definitely a big fail with Apple's QC.

updated to 10.8.2 hoping that it would fix the problem... but no. so annoying!
Battery was fine under Lion with 7+ hours...

now i'm getting 3hours...

54% charge and 1.5 hours battery. what a joke!

and my fans are spinning constalny even though i only have Safari open.

what the **** apple? sort this out!!!!!

my MBP 15" (late 2011) almost lost 1 hour battery life right after the upgrade, 10.8.1 shows me approx 3:55 hrs at 98% Battery, now there are just 3:05 left. Unfortunately the Statement is right. Great Job Apple, I mean really. *grrrr*

@Apple

You should consider your speach about "high demand for the quality" and such like "the best User Experience" and all the other bla bla bla. Those times were an Apple Release was reliavble are gone. Apple-Users maybe should act more as responsable Microsoft-Users: always wait 'til the 3rd SP is out, then buy. Otherwise stay with what you have and enjoy. Is that what you want Apple?

I got several days testing the battery life on 10.8.2 but no luck, still 5 hours tops if using low bright on the screen, if I use the auto-bright (which is what I should for my eyes sake) the battery would last 3 hours

Haven't seen any other update from apple so I guess they just don't care at all, we're all alone on this.

Has anyone tried to install windows 7 on the mbp hardware? maybe windows does has a better usage of the battery life, I'm just guessing.

Seems like the myth of apple's love to their users is quickly fading away.

Did anyone tried the ML fresh install?

That is what I did with the iPhone 3G and iPhone 4 waited a few month to hear what people sad and if there were any problems with it (like with the iPhone 5 problems). Now I am planning on leaving iPhone and buy the Nokia Lumia 920 instead.

Windows 7 on bootcamp gives me about 4 hours of battery on low light.

8 - 9% drain here too... it really seems like Apple cannot live without Steve Jobs. Everything is doing downhill with Apple.

remember 10.5 to 10.6. and 10.6 to 10.7 and now 10.7 to 10.8 // same place - same issue. IMHO This was/is always an issue of missing Pre-Release-Upgrade Tests. // Well, screw up this boring testings, lets give the beta out to the users, they can't wait anyway and see how it went. Gona be fun. Vista Style. 🙂

Looks like ... I found the ....errr .... lifeline back in time capsule.

I upgraded from 10.8.1 to 10.8.2 the second Apple notifier popped up. The battery life went downhill after that. I had to hide the percentage option (honest) as the decline truly freaked me out. Before I was getting something around 7 hrs and after 10.8.2, it became around 4 hrs.

I managed to switch back to 10.8.1 and have my battery life back to ~7 hrs. However, I paid some price for not understanding how TC's restore option works. After restore I have lost my iPhoto library because I was not backing it up 😟 Still ... I have the battery life back ...

Moral of the story for me: don't jump wagon with Apple (anymore). I will not do so anymore.

I can't help but think that that the latest update makes the laptop check things and update things more frequently...Twitter, Facebook, Mail, Calendar, etc.. may have something to do with the power drain (even in sleep mode)

I know there was also a power manager update for my Air in the midst of all the updates for Intel's power magement system.

Also with this OS update, and power manager update time machine back ups were also become "un attended" or done in the background.

There is just too much going on to pin it down to just one thing. Perhaps there are too many background processes going on.

how exactly did u test the tme of use? did u use a stop watch?

I have tested time with a watch to be sure that it was correct. First I though maybe Apple had made the same mistakes as with the iPhone software a few years back - remember the thing about the bars in the upper left not being correct.

I have done a clean install using the install????.dmg method to create a DVD and a USB. Neither worked. No recovery from Time Machine or Migration from anything. All fresh and reinstall clean any apps I use and it still won't help the battery. I did finally fall back to a 10.7.5 machine using the clean install, rebuild of recovery partition, etc. and get 7 to 8 hours of usage. Clock time, not what the indicator says on the MBA. This is doing web browsing, RDP to windows desktops, running diagnostics on various systems all across the Wireless. This isn't not a hardware problem, or applications problem as once I didn't add any apps that didn't come with Mountain Lion and still only had 2 - 3 hours at best.

If there truely is anyone reading these from Apple, please take this seriously. You have die hard Apple fans as well as newbie converts on this board and we have all voiced this clearly and proved this to be a Mountain Lion issue.