Lithium Ion Polymer Battery - 3.7v 100mAh : ID 1570 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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7.2V (7.4V) 3500mAh 10A Lithium Ion Battery Pack with Wire Leads 2S1P – Liion Wholesale Batteries
Tenergy 18650 2200mAh 3.7V Protected Lithium Ion (Li-ion) Bare Leads Battery - Bulk (30027)
3.7v 5000mah 4060140 Polymer Lithium Ion / Li-ion Battery For Tablet Pc 7 Inch 8 Inch 9inch Mp3 Mp4 - Rechargeable Batteries - AliExpress