Lithium Ion Polymer Battery - 3.7v 500mAh : ID 1578 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Lithium Ion Polymer Battery with Short Cable - 3.7V 350mAh : ID 4237 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Blomiky 7.4V 600mAh Li-ion Rechargeable Battery Compatible with Some Gel Water Ball Blaster and WPL C24 D12 RC Truck / D12 Battery 2 : Toys & Games