TP4056 MINI USB 4.5-5.5V 1A 18650 Battery Charger Module Panel Pack of 10 - Blue - Overstock - 36405496
Lithium Battery Charger Module Charging Board With Protection Dual Functions 1a Li-ion Micro Usb 5v 1a 18650 Tp4056 - Buy Nodemcu,18650 Micro Usb,Charger Module Product on Alibaba.com
switch mode power supply - 18650 in series while charging using TP4056 and connecting two buck regulators LM2596 in parallel, is it safe? - Electrical Engineering Stack Exchange