Apparently I have fallen victim to the dreaded broken micro USB connector. At first the internals (mainly plastic) slid up inside the metal sheath when inserting the plug from the power source. I could disassemble the light and push the plastic piece back down so that there was contact with the power supply.

Recently, the entire micro USB connector fell away from the circuit board, rendering charging disabled. If the micro USB was soldered onto the circuit board, it was not heavily soldered.

Anyone have any suggestions or comments on whether or not the micro USB adapter was really soldered to the circuit board?