Lithium Li-ion 18650 3.7V Battery Charger Board Adjustable DC-DC Step – Sun Cheong Computer Company Limited
Amazon.com: Blomiky 3.7V 800mA Fast USB Charger Cable with SM-2P Connector Plug fit for 3.7V 500mAh 800mAh 1500mAh Lithium Lipo Battery 3.7V Fast USB 2 : Toys & Games
18650 - 3.7v Battery Charger | How To Charge 18650 Li-Ion Battery | 5v To 4.2v Converter | 2n6292 - YouTube
power supply - Step up converter (3.7V to 5V) that will also charge battery! - Electrical Engineering Stack Exchange
5V 1A Mini USB 3.7V Lipo Lithium Li-ion Battery Charging Module Charger Board 1S | eBay
UpBright 5V AC Adapter Compatible with CAT 3.7V DC Rechargeable Battery LED Work Light WorkLights 962841 3.7 Volt CATwork CATLED Neiko 40464A RK-0421100 4.2V 4.5V Power Supply Cord Charger (NOT 12V)
5Pcs 2A USB 18650 Lithium Li-ion Battery Charger Module Boost 3.7V to 5V 9V 12V