Mini PowerBank v2

Mini PowerBank v2.

Electronics used this one: https://www.aliexpress.com/item/Automatic-Protection-Dual-USB-5V-1A-2-1A-Mobile-Power-Bank-18650-Lithium-Battery-Charger-Board/32901484509.html?spm=a2g0v.10010108.1000001.7.f2f14ee2GBn7T1
Lithium polymer battery of this type: https://www.aliexpress.com/item/1-2-4Pcs-103450-3-7V-2000MAH-lipo-polymer-lithium-rechargeable-battery-for-MP3-GPS-navigator/32902182206.html?spm=a2g0s.8937460.0.0.1c772e0eyTf78d