Q: Battery life dropped considerably on Mountain Lion.

My mid 2011 13" Macbook Pro i5 2.333GHz 128GB harddrive, faces since the update to Mountain Lion as well a dramatically lower battery lifetime.

I would estimate that the battery drains some 40-50% faster. I don't determine a warmer bottom or a higher fan activity since the update so far.

Best regards from Germany.

I should also add I do notice the bottom of the machine is very hot (ie the memory area) so something is hitting the memory bank quite hard to drain the memory, yet in the Activity Monitor there is nothing showing as hogging the CPU.

I have a late 2011 MacBook Pro which is only a couple of months old. Battery life is down to 3 hours from the 6 I used to experience in Lion.

I have noticed (from Activity Monitor) that every few seconds, even while idling, SystemUIServer peaks to as much as 95% CPU and then drops again, then peaks again and so on.

I can confirm that the battery climate is the same here in central France.

Battery status of my 2010 15" MacBook Pro i5 says "Service Battery" and battery life starts from 3 to 4 hours. It used to be 7-8 hours. It drains quicker than before.
I've done the SMC reset procedure described earlier, and reset the Energy Saver settings to default.

Model Name:          MacBook Pro

  Model Identifier:          MacBookPro6,2

  Processor Name:          Intel Core i5

  Processor Speed:          2.4 GHz

  Number of Processors:          1

  Total Number of Cores:          2

  L2 Cache (per Core):          256 KB

  L3 Cache:          3 MB

  Memory:          8 GB

  Processor Interconnect Speed:          4.8 GT/s

  Boot ROM Version:          MBP61.0057.B0F

  SMC Version (system):          1.58f16

  Serial Number (system): ?

  Hardware UUID:          25534838-2CBB-599D-9A9C-D59D210D83D2

  Sudden Motion Sensor:

  State:          Enabled

The bottom of my late 2011 15" MBP is quite hot using ML compared with 10.7.4.

I don't know if this is related to the battery problem in 10.8 and the hot bottom side of the MBP but the keys in the a, s, z and shift key area are perceptible warmer than the other ones.

Further to my message on page 26, here is a screen shot after 3hrs and 6 minutes:

Looks I might be getting 6 hrs + and may not have the problem some of your people out there are having.

Hope you get is sorted with a patch from Apple soon.

I should add a little detail on my experience with this issue. I use my MBP Early 2011 mainly for personal use.

Pre ML upgrade, I would have the machine fully changed, then use for an hour or so as I retire of a night, checking emails and browsing youtube using safari. I alos run XBMC a bit.

I would simply shut the lid and find that there would be very little change in battery percentage between when I closed and opened the lid.

As a rough example, I may have 66% remaining when turning on either the next morning or next evening (bit vague)

Now on ML, I am using the MBP in the same fashion, but opening it up in the morning to see only 20-15% remaining?

I have also noticed my battery drain in standby. I had very little impact the next day and this morning it had gone down drastically over night in standby. Something really odd going on with ML.

I'm in France. Also facing the battery issue. After update to ML my MacBook (late 2009) displays Service battery and it drain battery much quicker than before.

Hi,

I am using a MBP8,1. After upgrading to mountain lion battery drain has increased dramatically. Also the bottom of the MBP is getting quite hot.

All in all battery life has decreased by about 50%.

my battery life has dropped to about 2 3/4 hours total with mountain lion installed. Justnormal email and a few videos of olympics

I have a MacBook Pro Retina display with a great battery time when running with Lion.

5 days ago I installed Mountain Lion and the battery lasts sensibly less, half the time than in Lion with the same workload

I upgraded a couple of days ago, and I am also experiencing a major drop in battery life on my mid 2010 mbpro (6,2). However, I found out that by using Safari instead of Chrome, the battery life goes back to what I was used to with Lion. It looks that Chrome forces the use of discrete graphics, but strangely, even if I force switch to integrated in gfxcardstatus, the battery life remains atrocious.

That the remaining battery time has been removed from the status bar is also kind of stupid.

I have the same problem... battery with 5 h dropped to max 2 h.

MacBook Air 13' mid 2011.

Regards from Poland

hey guys i just wanted to let you know what my case is here, and im wondering what to do with it, my mbp is hotter than usually, and while its running at 76 celsius,  not one program is running. and a quik question, every so often does your mac give u a warning that it cannot read the memory and i have to force quit safari if im using it,