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Lithium Ion Polymer Battery - 3.7v 100mAh : ID 1570 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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PKCELL Flat Top 18650 3.7V 3000mAh Rechargeable Li-Ion Battery
3.7 Volt Lithium Ion Battery | Emergency Lighting |ELSC