Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bad Batch!!

There is a "bad batch" of Zen Nano Plus MP3 players. I unfortunately got one of them. I changed batteries and when I tried to play my songs that I downloaded from WalMart it kept shutting off! I e-mailed the company and they told me to run a program on the MP3. It deleted all of my songs but I had them backed up. I tried it again and it did the same thing. I called customer service and got a very helpful customer service person. He told me there was a "bad batch" of players out there that won't play the WalMart downloads if there is a new battery in them. My options are to deplete the battery first or use rechargable batteries. After 9 hours of messing around with this thing and depleting the battery I got it to work again. They said they might have a solution to the problem at the end of the summer but until then I am supposed to use low juice batteries. If you purchase this player download from another music store besides WalMart. Good luck!