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BOARD_ADC_OPEN_CIRCUIT_V is the voltage present on an ADC due to the bias current on the terminition resistor. BOARD_VALID_UV is the under voltage min set by resistors on a board's Power selector. A battery is considered connected when the Voltage measures is greater than BOARD_ADC_OPEN_CIRCUIT_V. In the case where BOARD_ADC_OPEN_CIRCUIT_V is greater then BOARD_VALID_UV we can use the HW to qualify connected.