Charging iphone 3Gs by computer is ok?

Hi everybody,
I have just bought an iPhone 3Gs 32 Gb and now I've got a question:
charging the iPhone using by the computer lots of frequent short times is ok for the lithium battery? Does this action damage the iPhone? Is better charging it in only one long time (for some hours to have 100% battery) or chargin it frequently in lots of short times?
Thanks!
Bye

I believe it is better to charge to 100% more often than not. I can't imagine many "light" charges would be the best...
This page will be of interest to you:
http://www.apple.com/batteries/iphone.html
And this excerpt applies to your question:
Use iPhone Regularly
For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).

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