Sansa sandisk mp3 player 1 gig

Theoretically, you should be able to use this one forever, if you keep charging it. The battery isn't replaceable, so hopefully it will last you a good 3 years or more. The #1 threat to Mp3 players isn't the battery, but keeping up with software/computer environment changes. Most mp3 players introduced to date only last 1-2 years - much shorter than everyone had originally thought.