How many cycles should ibook G4 battery last for?

I got my ibook last year right before school started and still love it. The only problem is the battery seems to be dying on me. I've heard that the batteries should last about 2 years or maybe a little less.
Mine says its gone through about 270 cycles, and it dies in about 5-10 minutes without being plugged in now, even with the screen brightness on the lowest and energy saver being used etc...
I just wanted to know if this is common or if it isnt how I would go about getting a new battery because I dont have the $ to pay for one unfortunately but I need my ibook for schoolwork.

Welcome to Discussions!
Apple's batteries are designed to hold upto 80% of their charge after 300 cycles. Of course, its "upto", and not guaranteed.
You can try this to see if you can't get a little bit more out of it: http://docs.info.apple.com/article.html?artnum=86284
Best,
-josh
iBook G4-DVD, iPod Shuffle Mac OS X (10.4.8)

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