4PCS 3.7V 3000mAh Li-ion Rechargeable Battery with 2-Slot USB Smart Battery Charger - Walmart.com
3.7V 500mA Solar LiPo Battery Charger - RobotShop
For Universal Battery Charger For 3.7V 18650 Li-ion Rechargeable Battery - Walmart.com
5V 2A Type-C USB 3.7V 18650 Lithium Li-ion Battery Charger Module DIY Power Bank | eBay
EU Plug Universal 3.7V Li-ion Rechargeable Dual Battery Charger - China Charger and Rehcrageable Charger price | Made-in-China.com
Amazon.com: JacobsParts Smallest USB Type C 3.7V Lithium Battery Charger Board 4.2V Charging Module with Protection Circuit and LED Charge Indicators 5V USB-C Input (2 Pack) : Automotive
How to make 3.7 volt battery charger - Electronics Help Care
USB / DC / Solar Lithium Ion/Polymer charger [Rev C] : ID 390 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits