Lithium Ion Cylindrical Battery - 3.7v 2200mAh : ID 1781 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: EEMB 3.7V Lipo Battery 300mAh 602030 Lithium Polymer ion Battery Rechargeable Lithium ion Polymer Battery with JST Connector Make Sure Device Polarity Matches with Battery Before Purchase!!! : Health & Household
UltraFire 2200mAh 3.7V 18650 Rechargeable Li-ion Battery Without Prote
Lithium Ion Polymer Battery with Short Cable - 3.7V 350mAh : ID 4237 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits