Battery

I read that the Sandisk Clip Sport battery is good for 25 hours. Afte 8 or 9 hours listening the radio, I have to charge again the battery. What is my problem?

Merci

25 hours is the battery life for the playback of 128kbps MP3 files at 50% volume and the LCD is off. Running the FM receiver requires more battery power so what you are seeing is normal for playback of FM radio. 

Merci