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
PALO 3.7V battery charger 18650 charger for 18650 26650 16340 14500 lithium battery+3.7V 14500 Li Ion Rechargeable Battery|Rechargeable Batteries| - AliExpress
Simple 3.7v Battery Charger With Auto Cut OFF Circuit - YouTube