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3.7 v lipo battery pack, 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, Ion Polymer Battery - 3.7v 100mAh 1570 $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits