Disconnecting power from external USB connectors of conformable wearable battery packs in the presence of conducting fluids

A conformable wearable battery pack for detecting presence of a conducting liquid in an external connector, the conformable wearable battery pack comprising:

• a sealed housing;
• a flexible circuit board in the sealed housing;
• one or more batteries connected to the flexible circuit board;
• a uniform serial bus (USB) connector configured to provide power from the one or more batteries external to the sealed housing, the USB connector comprising a plurality of terminals including at least a power terminal, a ground terminal, and at least one additional terminal, wherein the power terminal and the ground terminal are in a first plane and the at least one additional terminal is in a second plane spaced from the first plane;
• a controller, connected to the flexible circuit board, comprising a plurality of pins including a positive voltage level pin connected to the power terminal and a ground voltage level pin connected to the ground terminal;
• one of a pull-up resistor or a pull-down resistor connected to the at least one additional terminal to pull a voltage of the at least one additional terminal to one of a high voltage level or the ground voltage level;
• a detector configured to determine whether the voltage of the at least one additional terminal satisfies a voltage threshold corresponding to conduction, in the conducting liquid, between the at least one additional terminal in the second plane and one of the power terminal or the ground terminal in the first plane;
• and
• a power reduction circuit configured to, based on the detector detecting the voltage satisfies the voltage threshold, reduce power supplied by the positive voltage level pin.