Amazon.com: EEMB Lithium Polymer Battery 3.7V 300mAh 602030 Lipo Rechargeable Battery Pack with Wire JST Connector for Speaker and Wireless Device- Confirm Device & Connector Polarity Before Purchase : Health & Household
Amazon.com: HXJNLDC DC 3.7V 1300mAh 503759 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Health & Household
Lithium Ion Polymer Battery - LP451528 3.7V 150mAh
Lithium Ion Polymer Battery with Short Cable - 3.7V 420mAh : ID 4236 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits