Bought a 4th generation iPod Shuffle a few days ago. After charging it overnight, I only got 3-hours of battery life out of it. So I returned the iPod and exchanged it for a new one, but the new one has a similarly low battery life:
I charged it over night, took it to the office, and when I turned it on for the first time in the afternoon, it says only 25% charged!! It was turned off all the time.