Flipper will not power on

My Flipper will only power on when connected to a power source. When it is powered on, the battery status shows fully charged. Once I disconnect the USB cable, it powers off and will not power on no matter what I try.

Updating my first post. I opened up the Flipper to inspect the battery, and what first jumped out at me, almost literally, was that one of the pins (the center one of the three on the under side of the Flipper, had come loose from the system board. I was able to set it back in place, but not permanently attach it. Then I put the cover back on and secured the four screws. This seems like very poor quality control. Any thoughts?