What is the battery expectancy for late 2009 13-inch macbook pro

I have a 13-inch, Mid 2009 Macbook pro and it seems that the battery has been draining quite fast. It was ast 85% charge about 30 minutes ago and now it's down to 24%. Is this typical for "normal wear" usage? or could this be a battery issue?

Yes and No. It all depends on many factors.
Age of battery, yours is 3+ (going on 4) years old.
Use of battery, how many cycles does it have.
Usage habbits, whether you are in the habbit of draining the battery down to the point the system almost shuts off or does shut off, neither is good for the battery. Leaving it connected to the AC all the time. There is a system included to drain the battery and recharge it. But it doesn't do it enough or starts the recharge at to high a percentage creating a long term Short Cycle condition.
All batteries only last so long. 3+ years isn't bad and yours still works although it does lose it charge more rapidly, which is to be expected with age and use.
Even if you never really used it and it sat on a shelf eventually that battery would be no good. Li-ion batteries have a shelf life. Used or not used it will eventually fail to work.

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Hi all, this is my second to last resort (last is sending in for repair xD). Well anyways, hope that you guys can help me solve this problem so I won't have to go there .
Here's the story:
I recently purchased a custom, late 2010 17-inch MacBook Pro with these apple upgrades:
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-Corsair P128 CMFSSD-128GBG2D (128gb ssd)- http://www.newegg.com/Product/Product.aspx?Item=N82E16820233087
I purchased both of these items from newegg. The solid state drive came off of my old laptop, which I installed into about 6 month ago.
So, once my MacBook arrived, I didn't even turn it on. i went straight into unscrewing the back and installing the components. The process went smoothly and I booted up the machine afterwards. Everything looked fine at first, but the installation failed about midway through (due to failure to copy necessary files). But I tried and tried again and after about the 25th time (yes I know, it took the whole day), it finally worked. The reason for my persistency is because everytime it would fail, it would fail at different spots of the installation, so I figured that eventually I will get lucky. So I unchecked as many items as possible under the "what to install" list and it finally went through after many tries.
Now, with OSX running, the laptop would constantly freeze with the beach ball of doom.
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-installed ram is defect
-apple osx cd is defect
-compatibility issues with solid state drive (the drive must be fine since it worked in my old laptop for 6 months)
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-ran 15 hours of memtestosx with zero errors -> ram is fine
-since osx is running without a cd now, not the cd
-very unlikly that there are compatibility issues with harddrive
I did a TON of googling and found that many people have the same problem as me, but mostly on much older models (in which apple fixed through software/firmware updates) and also flash problems. I tried to installed these updates but OSX said that my system does not require them. So, I installed a beta version of flash and everything was much better, the computer started up 3 times faster and it did not freeze for a while. Hoever, after a couple hours of on-off use, it froze again . Knowing that it must be flash-related now, I uninstalled flash all-together. However, the problem still remains.
Here is a more detailed description of when this freezing occurs:
-mostly during safari operations such as loading a webpage or closing the browser
-it froze a couple of times while opening things such as the applications folder from the bottom dock or opening the "about this mac" window.
-before the flash beta update, it would freeze in the middle of a flash video playback from internet (like youtube). But after update, this freezing stopped occuring (did an hour of testing) and I actually got to the point where if I am loading a page in safari and it "looks" like it is freezing, I could close safari before my system goes into complete melt-down (once beachball starts spinning, all hope is gone)
Now, I am thinking that it might still be the OSX cd. Even though the installation was successful, it might have copied corrupt files that are freezing the laptop. I have order a replacement cd from apple and it should arrive within a couple of days. However, I still have big doubts on this being the actual solution.
I know that since this is a very recent model, it is hard for many people to have come across such problems yet (especially with my specific specifications). However, if anyone has an idea, or a past solution that is fits the description, any help is greatly appreciated.
Thanks for reading

Hi Dale,
Thanks for the replies. No, when I powered up the Mac, I put the OSX cd in first thing and press and held "c" until it started booting off the cd. Then I proceeded on reformatting the drive and etc.
I read all of that forum post. I reseted the PRAM, still freezes.
The new OSX cd came today, same thing happened, although it only took me 2 tries to install OSX. However, it would still freeze afterwards.
I very much realize that it could be a ram problem and how Corsair doesn't work so well with apple. However, Corsair has yet to let me down, that's why I chose it over crucial when I purchasing the ram. I did a lot of research and it seemed that as long as the ram meets spec, Macs will take it. And after 15 hours of memtestosx testing, I highly doubt that it is the ram.
However, I think I might have found the solution. I finally got the time to free up one of my external hard drives and installed OSX onto it to test the hard drive. I checked everything for the optional installs (except rosetta and the old quicktime) to further confirm my theory. After a very long install, it completed successfully! the odds of that happening on the first try using the old system is quite low (due to my countless install attempts with the old system and it failing with only half of the load of my new install).
And since then (probably around 3 hours of usage), my MacBook has not encountered a beach ball of death yet (well, sort of. it did it once when I was restarting, but I think that was due to the old drive because it is still plugged in and it was probably trying to read it while it was frozen in the closing phase of a shutdown). Anyhow, I think a few hours of usage will definitely confirm my theory and hopefully a ssd firmware update will solve my problem so I won't have to invest on a new ssd xD.
Ill update once I have made any progress

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