Lithium Ion Polymer Battery - 3.7v 150mAh : ID 1317 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: EEMB 3.7V Lipo Battery 340mAh 542730 Lithium Polymer ion Battery Rechargeable Lithium ion Polymer Battery with JST Connector Make Sure Device Polarity Matches with Battery Before Purchase!!! : Health & Household