... .small impendance. 3.lighter weight. 4.larger capacity. Rechargeable ultrathin Li-polymer battery 3.7v 200mAh 502030Speifictions:1. safety very well.2 ... speed.Detailed Product Description: 1. 3.7V 200mAh Li -Polymer Battery 2. CE,RoHs,UN38.3 Certificate 3. A Grade ... , MP3, MP4, R/C toys, power-driven tools & toy, camcorder, digital camera, head set stereo, handy terminal, mini disc player, etc. Extra ...