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this is what is says on apple.com FAQ;

Question: Do I need to completely empty the battery before charging it, and does doing this prevent the so-called "memory effect"?
Answer: You don't need to empty the battery before charging it. Lithium-based batteries, like those used in iPod, have none of the memory effects seen in nickel-based rechargeable batteries.

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Q: Do you need to completely drain the battery the first time you charge your ipod touch before charging it again If you do not do this what happens?
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