AA battery powered mp3 player?

"They just arrived a cople days ago.  I tried 2 and they’re not lasting very long.  My charger might just be broken or may not be the right one. "

Or perhaps those batteries aren’t so great. I now stick with brands of batteries I know. It seems like Sanyo probably has the best reputation for nimh rechargeable batteries. I have also had good luck with Kodak nimh rechargeable batteries. I think the Kodak nimh batteries might be made by Sanyo. I think Sanyo may make nimh batteries for some other brands as well. Energizer nimh batteries also seem to get good reviews.

http://www.rechargeable-battery-review.com/consumer-batteries/aaa-battery-tests/aaa-mp3-player-battery-test.html