I have an early 2011 15" MacBook Pro. I updated to Mountain Lion and experienced an immediate, dramatic loss in battery life. Before, under Lion, I was getting several hours of life, depending on type of use. Now, I'm seeing the Service Battery message (which I wasn't before), and, in About This Mac (and with the coconut battery app) battery capacity is fluctuating between 1910 and 2600. I've tried resetting SMC and PRAM, and letting the battery run down, with no discernible results. The machine is only 16 months old, and until Mountain Lion, had only normal wear and tear on the battery.
I will also mention that I upgraded the HD to a Seagate 750GB Hybrid Drive which hurt battery life somewhat. But that did not cause the sudden downard spiral in capacity which happened after the operating system was upgraded. It's almost as if the system simply won't recognize the full capacity of the battery. Maybe there's some way to reset this (other than SMC)? Because my machine now thinks that the battery is 2/3 gone.
I was in touch with a friend who is an Apple Genius, and their only advice was to come in and have the battery changed. (Which I might do if no other solution presents itself, even though I don't have Applecare, and I can't afford the $130.)
I have discovered the same problems as everyone else here with a late 2011 MacBook Air 128gig.
Battery power diminishes right before my eyes I can watch it depleting by percentage point as I am using it.
Last night on full charge and with the power connected I watched a movie and it dropped imediately to 98% and then stayed at that percentage and would not charge upwards.
I then watched a movie on battery power and it dropped 34% in that period which is way to fast, just haveing the Air running with no apps open the battery percentage drops in 1% increments fast enouph to see the change.
I have reset PRAM. Rest SMC twice, Reinstalled Mountain Lion but the problem persists.
Not real happy about Apple's slow response to this have they lost the plot now Steve is gone and care only about profit ? Surely they have enough money in the bank now to throw some resources at this problem.
Has anyone had a response from Apple regarding this issue ?
1. Went into System Preferences/Users, picked out current user (admin), found in 'Login Items' several items with yellow warning triangles. Decided they were all non-essential, highlighted each and clicked on the '-' button at the bottom to remove them from the list completely.
2. Went into OS X Mail preferences, General, changed second item 'Check for messages' to 'Manually'.
3. Went into Disk Utility and repaired permissions on the main hard drive.
4. Restarted the Mac to clear the removed Login items.
Hope this helps someone - or maybe just reveals my inexperience with OS settings as a noob!!
Everything helps! Thanks. I did what you suggested, and I too found three log in items with yellow triangles (couldn't be found). One was an iTunes Helper!! That suggestion on its own was helpful....
I've just unplugged it and I'll see if it helps.... !
BTW, Apple are going all out to fix this.... I just had a call from them and passed a load of data to them. I hope it really was Apple!
Update: Well, it doesn't seem to have helped.... it dropped 2% in the time it took me to post the above.
My MacBook Pro from ultimo 2011 could easly do 6 hours of surfing (only safari running), before upgrading to Mountain Lion, now it ONLY TAKES 2 1/2 -> 3 hours, i am very desipointed and had the same problem with the upgrade from Snow Leopard to Lion.
Apple please make a bug fix as fast as possible!!
I have tried everything, and can't see enything unsual in Activity Monitor.
Just got off the phone - 45 minute call with an Apple technician. We ran a few items on my system and I sent him the files. I was finally asked to update dropbox or remove - I never use it so I removed it completely (more than just dragging it to the trash bin) Good to know Apple is on top of this and gathering as much info from individual users as possible. Interesting - they called me
I've been following this thread since I've ordered my Retina Macbook Pro.
I don't have it yet and I'm waiting (im)patiencly to be delivered, hopefully between August 17th and 21st.
The whole problem to me seems to be related to the SMC driver.
- higher temperature (for most)
- shorter battery life (for most)
- longer battery life (for some)
- no strange activity in the Activity Monitor
- closing (some) applications help sometimes
- resetting the SMC helps temporarily
- downgrading to Lion seems to help (for some). It's unsure if the downgrades who got a longer battery life back did an erase first or not.
This leads me to believe that de data from the SMC (System Management Controller) might be interpreted differently by Mountain Lion than for Lion. Most likely, there are a bunch of calculations going on to determine battery time remaining and battery life.
I don't know if it's possible, but maybe putting the Lion version of the SMC driver back on an installed Mountain Lion installation might help?
Just my 2 (Euro) cents.
I do not think so. You argue, that the same data is differently interpreted.
In fact something (and that seems to be deep in the system) forces the CPU or the GPU or both to work a lot more. The system reacts properly by using to fan(s) to cool down everything.
The workload is real, even Lion would use the fan(s) to react. Thus, it has nothing to do with interpretation.
I am wondering if this problem is not caused by Mountain Lion at but maybe the Firmware upgrade some portables had to install for PowerNap to run. Not sure of course but it seems laptop related and only most that had to install this firmware upgrade what's the thoughts on that ? Or are some of you having this same problem and haven't installed the firmware upgrade ?