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Lithium Ion Battery Pack - 3.7V 6600mAh : ID 353 : $24.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: pkcell 4 Pcs ICR 10440 Rechargeable Lithium Ion Battery,3.7v Batteries 350mAh (0.39 * 1.73 inch, Shorter Than AAA Size) : Health & Household
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