Why is my iPod nano not charging?

I experience some problem with the battery of my iPod Nano 5th gen.! I can only start it when it is connected via USB to my PC! I have installed iTunes and I have synced all my songs in it but the battery is not charging! At the top right the bar has a lightning bolt but it is actually cosmetic! When I unplug the device, it shuts down immediately and I cannot start it again. I have tried different ports in my PC, 3 hours being in charge but nothing!

Yesterday I restored the device to delete the old files and now when I connect it to my PC, it says connected, eject before disconnecting and now I cannot even use the iPod when charging.