How To Add USB Port For Charging 9V Batteries!

Stop Buying 9V Batteries! Make USB Rechargeable 9V Li-Ion Battery
DIY Rechargeable 9V Li-Ion Battery is very easy. All you need is a small 3.7V Li-Po battery, an Adjustable Step Up Module with Charging and Discharge feature, and a non-usable 9V battery body.

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Parts list:
Circuit: https://shorturl.at/fGY67
Battery: https://shorturl.at/glwD6
Switch: https://shorturl.at/duBVY

Detailed parts list:
https://drive.google.com/file/d/1ZK3uYXivkMNKvbfkjnOM4LMD6pQnD92u/view?usp=drive_link

DIY USB 9V Battery - How to Make Rechargeable 9V Li-Ion Battery