Rechargeable batteries need to be kept in condition. How exactly that is done varies from battery type to battery type.
Nanos use Lithium Ion batteries. Have a look on the Apple site about Nano batteries. There is a section describing what to do. Use Google to learn more about the care of Lithium Ion batteries. Use Google to find out about replacing the batteries - how to and costs. There's some good guides online with step-by-step pictures
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