I can't figure out what is going on here. Sometimes I charge my iPod and it works just fine for hours. Other times I leave it plugged into a USB port all day and the battery is dead within moments. No rhyme or reason to it. It connects to iTunes just fine. Also, I changed my laptop settings to keep the computer from going to sleep for 4 hours. Finally, I can't recall if the little amber charging light ever stops blinking while plugged in. Is it me, or is this thing defective?