My iPod gets fully charged and within 20 minutes, it’s dead. What do I need to do?

It appears your iPod Touch battery is failing.

Bring your iPod Touch into your nearest, “local” Apple Store or Apple authorised reseller/repair center for diagnosis, evaluation and potential options.

Best of Luck to You!

Call your local Apple Store and make an appointment for them to check it out. Afterwards they will tell you your alternatives.

It sounds like the battery is dying.