Hey everyone,

I'm tinkering with a power bank circuit that I extracted from a disassembled power bank.

I disconnected the 3.7V LiPo battery from the circuit itself and connected the terminals where the battery used to be with a power supply that's also outputting 3.7V.

Connecting the power supply towards the power bank circuit however does not allow my phone to charge. My phone is connected to the circuit via a USB-C to USB-C cable.

I tried varying the voltage of the power supply between 3.2V - 5V and my phone still wouldn't charge. Is the power bank circuit only meant to work with a LiPo battery and no other power source?

 

Welcome to AAC.

Did you reconnect the LiPo cell to check the PCB was still operational?

 

How many cells did the power bank use? If there are two cells in series, it would need a higher input voltage and possibly connections between the batteries.