iPod battery replacement
Can you get replacement battery for iPod touch
Can you get replacement battery for iPod touch
Make a genius bar appointment with Apple for an evaluation.
They have diagnostic tools and can tell you what options you have.
Apple will replace your iPod battery by exchanging the iPod with a refurbished one with a new battery for $79 (USA). Or you could do a Google search on "replace iPod battery" for a local or on line repair place that will replace the battery in your existing iPod. You can even find a replacement battery (same search) for about $10 and replace it yourself if you're up to it. You can find instructions on You Tube.
iPod battery replacement