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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 ICR18500 Battery 3.7V 1400mah Li-Ion Rechargeable with Button Top 6PC(They are not AA Size Battery) : Health & Household
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