You can make your own power bank with the help of a li-ion battery, TP4056 Module and a boost converter. This portable power bank can charger your cell phone with USB cable. Here is the demonstration pic:
You can see the components in demo pic and charging the phone by using it.
Check out the link for the complete DIY instructions to build this power bank, along with a circuit diagram and connections: DIY Power Bank
You can see the components in demo pic and charging the phone by using it.
Check out the link for the complete DIY instructions to build this power bank, along with a circuit diagram and connections: DIY Power Bank
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