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
Amazon.com: PKCELL ICR18500 Rechargeable Li-ion Battery 3.7V 1400mAh Battery Button Top 2pcs(Battery Size 18 * 50mm) : Health & Household