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Battery life

S

sashreek3

macrumors newbie
Original poster
Jan 27, 2013
4
0
Tampa, FL
I have a non-retina 13" uni body Macbook Pro which is approximately 2 yrs old and I am getting only 4 hrs of usage. My battery life seems to suck, I have only completed 175 charge cycles and it is at 97% capacity... How does the it cost to replace the battery.?

HOW much battery life are you guys getting?
 
Last edited:
I get around 4 to 5 hours on Mac OS 10.8.2 ML, I get around 3 1/2 hours on Windows 7. ML is a battery drain, on a Core 2 Duo with Lion it use to be like 6 hours of battery life.
 
sashreek3 said:
I have a non-retina 13" uni body Macbook Pro which is approximately 2 yrs old and I am getting only 4 hrs of usage. My battery life seems to suck, I have only completed 175 charge cycles and it is at 97% capacity... How does the it cost to replace the battery.?

HOW much battery life are you guys getting?
Click to expand...

At 97% capacity, changing it won't do anything for you.
 
It's not your battery. I'm only getting 4 hours maximum on a similar machine using ML. My wife's MBP is even worse.

I was getting 6.5 hours+ under Snow Leopard.
 
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Ricanlegend said:
You can totally get 10 hours if you turn brightnest to the lowest setting, turning wifi off , and only writing a document lol
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BS! Maybe on an iPad. Not a laptop. I've got two Airs, a MB and three MBPs. Which one should I 'try' that on? Lol...maybe you're agreeing with me and I missed the sarcasm...not sure;)
 
Document editing on lowest brightness under mountain lion gets me 10-14 hours on the 15" rMBP. I'm lucky to get 4 hours under windows doing the same thing.

at the wall power consumption is over 20w for windows at lowest brightness while idle, its less than half that under OSX.
 
DTKblaster said:
Document editing on lowest brightness under mountain lion gets me 10-14 hours on the 15" rMBP. I'm lucky to get 4 hours under windows doing the same thing.

at the wall power consumption is over 20w for windows at lowest brightness while idle, its less than half that under OSX.
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I don't see how this is possible. I have the same machine and I can't even get 4 hours out of it on these settings.
 
DTKblaster said:
Document editing on lowest brightness under mountain lion gets me 10-14 hours on the 15" rMBP. I'm lucky to get 4 hours under windows doing the same thing.

at the wall power consumption is over 20w for windows at lowest brightness while idle, its less than half that under OSX.
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K. I'm done being a dick about the subject. Like ethereal, I've got the same machine. In fact a pair of rMBPs. My wife has a 2.3/16/512. I've got the 2.7/16/786. I'm extremely happy with the battery life. Easily 6-7 hours with 'normal' brightness settings (for me about 50-60%). However, claims of 10-14 hours is Very extreme to say the least. I've actually got a project due Wednesday. All document and spread sheet based. I'm going to test these claims in my dark studio...where I will be able to see at the lowest brightness setting:)

Sorry...but those claims are extraordinary...both as an owner and a reader of reviews on the rMBP.

No doubt though, the battery life on my rMBP exceeds that of ANY Mac laptop I've ever purchased. The speakers kick ass too!

J
 
akdj said:
Sorry...but those claims are extraordinary...both as an owner and a reader of reviews on the rMBP.
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Read the engadget review?

http://www.engadget.com/2012/06/13/apple-macbook-pro-with-retina-display-review/#disqus_thread

It shows a large difference between the 2.3.ghz model and 2.6 ghz one (7h49m vs 9h22m), I can imagine that your 2.7ghz with its extra 33% L3 cache will only reduce this further.

The 512GB version of the samsung 830 SSD has an idle power draw around 5 times higher than the 256gb version, so your wife won't get light-usage running times comparable to the base model either.

512GB power usage: http://www.anandtech.com/show/4863/the-samsung-ssd-830-review/7

256GB power usage: http://www.storagereview.com/samsung_ssd_830_review_256gb

Doubling the amount of RAM won't be without a power penalty either:

According to the hynix whitepapers, the IDD6 state (the lowest power state [self refresh]) current is 40mA for 8GB DDR3L, so only 54mW (40x1.35).

http://www.google.com/url?sa=t&rct=...wDf7dO24pQqiOM9fk2jBxdg&bvm=bv.42080656,d.bGE

Screen manufacturer could also play a part, as the samsung version of IPS is their PLS tech, one of its main advantages is meant to be its reduced power draw vs IPS. (mine is samsung)

I have personally measured up to a 5% power draw difference of the processor alone under load, depending on its temperature. Depending on how these small variables stack up, its quite possible to obtain run times which are much longer on the cheaper models, but it wouldn't be something apple or intel advertises.
 
I am curious with under 200cycles how often do you use it? I know I'm a heavy user (1114 cycles in 2year7months) with 89%.

Also, I would say depending on what you do that's about right. Back then they used less strict tests so the battery lives at one point were I think 9 hours on the 15" and 10hours on the 13"!!!

But IRL tests they were anywhere between ~3-5. I'd say 4-5 is what you should expect under normal web browsing/document writing/emailing type situation.
 
sashreek3 said:
I have a non-retina 13" uni body Macbook Pro which is approximately 2 yrs old and I am getting only 4 hrs of usage. My battery life seems to suck, I have only completed 175 charge cycles and it is at 97% capacity... How does the it cost to replace the battery.?
Click to expand...
You don't need to replace your battery. There are many factors that impact your battery life. See the BATTERY LIFE FROM A CHARGE section of the following link for details, including tips on how to maximize your battery life.

The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.
 
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