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Li-ion Battery 3.7V/2000mAh – Flat - Gamasonic USA
Lithium Ion battery - 3.7V 4400 mAh
Amazon.com: ICR10440 Lithium Ion Rechargeable Battery 3.7V 350mAh with USB Charger (2pc Button top +Charger)(They are not AA Size Battery) : Health & Household