2011 MBP 13" battery

[pcomac]

i have almost new 2011 MBP 13" with 4 GB ram and 326? GB hard drive. my battery last about 4.5 hours when i surf the web. is this normal? how long does battery last you?

 

[simsaladimbamba]

Since this is asked so often, I just link you to some troubleshooting and information:

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)​

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