IPod 5th gen battery-wont turn on? battery dying way to fast

Hello,

Having same problem as recent people, battery dying way to fast but this time when i go to plug in the iPod it will have the apple icon but it will flicker back and forth and once i unplug the charger from iPod immediately shut off. it will turn on but turn on eventually or when it wants to. I tried holding main home button and power and nothing. I asked few friends and they said it's battery. Do i have to replace battery for 5th gen yes or no?