Charging problem

[RicTor]

Occasionally when booting up the PBP, charging does not start up. The PBP can then totally discharge its battery. This happens when the battery is full, having been on charge all night. It is not predictable!

I have been investigating and think I have found what  is happening - hence how to trigger charging. But I don't know why! 

Anyone else have the problem?

Are there any experts here who know the power / charging system? I can use help understanding the  schematic...

[Rodery]

You might want to ask a professional. When I had a problem with my circuit diagram before, I reached out to a technician at PCBWDX, and he answered my question right away.

https://www.pcbwdx.com/