I am a big lithium 18650 person and I have thousands of them, I found it super difficult to find a PCB/powerbank that would allow incoming charge and outgoing power also I would like to use 18650’s for my work cameras but these were test units for my house. . Here is another one I use MIFI7830L hotspot that’s last years model has an out USB-A and a in USB-C and will do passthrough and provide wifi… I been using it in our shop for a few cameras I move around.