Lithium Ion polymer - 3.7V 500mAh battery - Boutique Semageek
China Lithium Polymer Battery LP781837 3.7V 500mAh 1.85Wh with protection circuit and wires 30mm
LiPo Battery 500mAh + Best
3.7v 500mah 652631 Lithium Polymer Lipo Li Ion Rechargeable Battery For Mp3 Mp4 Mp5 Gps Psp Bluetooth Electronics Part - Digital Batteries - AliExpress