Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not what I expected

This mp3 player has been a pain in the butt. It worked fine the first few times, but now the battery is always dead, and I've only used it 3 times before. It will play for a little while (1/2 hr workout) but be dead the next time I try to use it. I'm not organzied enough to charge it every time I use it. I used to have a Nike mp3 player that lasted forever, and I guess I expected this to be as reliable, as RCA is a goo brand, but I am disappointed.