The cell is for mp3, mp4,Mobil Phone or other electronic devices with high capacity(Lithium Battery,li-polymer battery,li-ion) The Lithium Polymer Battery is for mp3, mp4,Mobil Phone or other electronic devices with high capacity(Lithium Battery,li-polymer battery,li-ion battery) The dimension is about 5.0*30*48mm. Lithium Polymer Battery(For MP3, MP4, etc.)