Amazon.com: AAA Size 3.7V 350MAH ICR10440 Lithium Ion Rechargeable Battery (16pc Button top) : Health & Household
10pcs Liter Energy Battery Good Qulity 3.7v,350mah,402535 Polymer Lithium Ion / Li-ion Battery For Toy,power Bank,gps,mp3,mp4 - Digital Batteries - AliExpress
Amazon.com: PKCELL ICR10440 Lithium Ion Rechargeable Battery 3.7V 350mAh with USB Charger (2pc Button top +Charger)(They are not AA Size Battery) : Health & Household