... ;3). Information devices, notebook computers, E-book, PDA;4). MP3 player, MP4 player;5). Flashlight, Mining lamp.We can offer ... the batteries or similar product be of interest to you, please contact me for further details including price. 502030 3.7V Lithium ... internal resistance6) Long cycle life, chargeable up to 500 or 1000 timesMajor Application: 1)MP3/MP4 player, bluetooth, speakers, car GPS ...