Amazon.com: Ecologic Mart Lithium Ion Batteries, 3.7 Volt Rechargeable Battery, 1200mAh LiPo Battery, Reading Book Light Battery Replacement, 103040 Type with Micro JST 1.25mm 2Pin Male Connector : Health & Household
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Lithium Ion Polymer Battery - 3.7v 100mAh : ID 1570 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Lithium Ion Polymer Battery - 3.7v 500mAh : ID 1578 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits