hey guys. i do charging port replacements on a regular basis. i have soldered on all models of phones dating back to the BB9900, so i can tell you after 3 ports, that it is not the port failing.
I have also ordered and replaced the battery resulting in the same failure.
i have scoured the board under a 10X microscope, and find no physical damage to board, or related components
The device says its charging, however, the % does not go up within an hour.