We are going to take a look at a USB charging board which support QC2 and QC3. This can also be connected with a 12v solar panel or you can connect it with any batteries between 6v to 32v. You can build your own LifePo4 battery pack and use this as a portable power bank. In this video i have used a 12v 6ah LifePo4 pack which i built it myself.
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