1.safety very well. 2.small impendance. 3.lighter weight. 4.larger capacity. Rechargeable ultrathin Li-polymer battery 3.7v 200mAh 502030Speifictions:1. safety very well.2. small impendance.3. lighter weight.4. larger capacity.5. Discharge cycle characteristics are excellent.6. No memory effect.7. Charge is very speed.Detailed Product Description: 1. 3.7V 200mAh Li -Polymer Battery 2. CE,RoHs, ...