Amazon.com: URGENEX 7.4V 1000mAh Lipo Battery 2S 35C Lipo RC Batteries with JST Plug Rechargeable Lithium Battery with 2 in 1 USB Charger for WLtoys A949 A959 A969 A979 K929 and Most
Lithium Ion Battery Pack - 3.7V 4400mAh : ID 354 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
High Capacity Lithium Ion Battery Pack – 3350mAh
Bluetooth Headset Bluetooth Cell Battery 801350 3.7v 500mah Lithium Polymer Battery Battery Mp3 Wholesale - Tablet Batteries & Backup Power - AliExpress