This cheap little 128MB mp3 player I got recently (comes with a FREE! cracked LCD screen) fails it at battery life. How much battery life do I usually get out of it? About 30 minutes (on cheap batteries, though), and even with shitty dry-cell batteries, that's damn low. Most batteries should provide about 8-12 hours of play time, and a nice rechargeable battery should approach 15 hours.
Although I haven't mentioned it, the mp3 player uses 1 AAA sized battery.
It supports failure. I can't store my /b/ folder on it, it got ate. Why? Dunno, maybe it WANTED to eat my /b/ folder.
Or maybe it was just FAPPING.