Ofeely 3.7V 500mah 602535 Polymer lithium battery Li-po Rechargeable Battery for Mp3 Tablet Pc DVD(Pack of 2) 3.7V 500mah 602535 Lithium Polymer rechargeable battery,good idea for DIY mp3,mp4,and other small size electronics goods. 100% brand new, High quality and high capacity, It can last work more than 7 hours. Built-in protection circuit PCM for prevent over charging or over discharging. Size: 6mm(H)*25W)*35(L), Rating: DC3.7V 500mAh.