DEBO1 3.7LI 1.0A: Developer boards - Charger board for 3.7V Li batteries, USB-C, 1 at reichelt elektronik
3.7v Li-ion 18650 Battery Charger Module - TP4056 / Micro USB Interface | POWER GEN - YouTube
Amazon.com: Blomiky 2 Pack 3.7V USB Charger Cable with SM-2P Plug Connector for Mini RC Amphibious Stunt Car Boat Trucks 3.7V Li-ion and Li-Po Battery / 3.7V USB 2 : Toys &
Auto cut off 3.7 volt battery charger circuit - YouTube
Amazon.com: 18650 Battery Charger 4 Bay Fast Charge, for 3.7V Li-ion TR IMR 10440 14500 16650 14650 18350 18500 16340(RCR123) Batteries, USB Intelligent Universal Rechargeable Battery Charger : Electronics
Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger [bq24074] : ID 4755 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits