USB / DC / Solar Lithium Ion/Polymer charger [Rev C] : ID 390 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: E-outstanding 3.7V Lithium Battery Balance Charging Line USB to XH2.54 Connector and XH2.54 to JST Convert Line for RC Aircraft Drone : Health & Household
For Universal Battery Charger For 3.7V 18650 Li-ion Rechargeable Battery - Walmart.com