Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh : ID 3898 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Li Po Rechargeable Battery 203040 300mah 3.7v 253040 Ultra Thin Lithium Polymer Battery - Digital Batteries - AliExpress
Panasonic Commercializes the Industry's Smallest Pin Shaped Lithium Ion Battery | Innovations/Technologies | Company | Blog Posts | Panasonic Newsroom Global
1.0mm 3wire Connector 5070120 3.7v 5200mah Wholesale Ultra Thin Lipo Batteries Rechargeable Lithium Ion Polymer Tablet Pc - Tablet Batteries & Backup Power - AliExpress
Lithium Ion Polymer Battery - 3.7v 500mAh : ID 1578 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Jst Ph 1.0mm 3 Pin Good Qulity 3.7v,1200mah 603450 Polymer Lithium Ion / Li-ion Battery For Tablet Pc Bank,gps,mp3,mp4 - Digital Batteries - AliExpress
Li Polymer Battery 3.7v 300mah | Battery Player Nwz B143f Sony - 3.7v 300mah 351743 - Aliexpress
Ultra-Thin LiPo Battery - 0.1mm thickness you can find here