Battery life lasting longer

when i got my ipod touch, it said in the manual or something, the battery life of the ipod depletes every time you charge it or something, & that you can pay to have it replaced (This would probably happen a long long time after you bought the ipod touch).
But can you make the battery life last longer, if you keep it connected to the charger.
p.s i have a charger connected to the mains, so i dont need to keep my pc on all the time.

Hello, 
If, for example, you charge a battery only 5%, it only counts as 5% of one cycle. The batteries in the iPod will do about 400 cycles before they are down to about 80% of their original capacity. So even after a year or so of heavy use you'll still have plenty of time.
It's important for the electrons in a Lithium battery to be kept moving. As such Apple recommend that at least once a month you do a full charge/discharge cycle to keep all the electrons in the battery moving:
http://www.apple.com/batteries/
http://www.apple.com/batteries/ipods.html
mrtotes

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    If you have AppleCare, they will mail you the battery.
    If you do not have AppleCare, call Customer Relations 1-800-767-2775. See what they can do for you. CS will determine if your model MBP qualifies for a free battery.
    An Apple Store is not the only place to go. There may be an AASP closer. See KB Article: http://docs.info.apple.com/article.html?artnum=304398 How to find your nearest Apple Authorized Service Provider (AASP)
    Another thing you can do is to go to System Profiler. Copy/Paste the Power info here. *Do not post any serial numbers.*

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