Has anyone been having battery issues with 2011 13inch Macbook pros ?

[kvnkvnkvn]

I have been having horrible battery issues and I'am wondering is it just mine or something defective about the notebook line

The battery would last only about 2 1/2 -3 hours of which could be web browsing, typing a document, looking at PDF's etc.

I have even done test with and without Flash or Silverlight, it gets worst with them by far. How long is the battery supposed to last and under what conditions.

How long does the battery last for you

 

[simsaladimbamba]

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Have a look at Activity Monitor (Applications / Utilities /) and select All Processes and sort by CPU to see what the culprit may be.
Also check the "System Memory" tab to see what your "Page ins:", "Page outs:" and "Swap used:" are.

image below uses sorting by CPU as an example

Further reading:

Mac OS X: Reading system memory usage in Activity Monitor
Making The Most of Activity Monitor
What Is Activity Monitor (or How to Take Your Mac's Pulse)​

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This should answer most, if not all, of your battery questions:
Apple Notebook Battery FAQ by GGJstudios
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