Fresh battery lasts about 1 hour

I have used the iPod for a day. Listening to some songs, nothing excessive. I noticed how the battery indicator with the screen on has about 80% but the device was still working. Suddenly, when locking the screen, the battery indicator appears near 10%. A few moments later, when the Hold button was unlocked, the ipod turned off and the message "very low batt" appeared on the screen.

During the playback tests that I did, from the 5 hour to the 8:40 hour, the battery indicator on the screen already appeared at 5% but it continued to work (for about 3 more hours) when the battery was drained and recharged, I assumed that it could be calibrated to show its real capacity, but it seems that it was not so

This whole issue of battery and indicators is very rare. thats no way to calibrate this batteries. i used 3 different ipod batteries with the same results.