A supply charging device includes a supply power connector having a housing with a mating end and a flange configured to be mounted to a panel. The housing includes power contact channels extending through a base receiving power contacts. The housing includes a guide member engaging a guide feature of a mobile device to locate a receiver power connector relative to the supply power connector. The supply charging device includes a retaining plate securing the housing to the panel. The supply charging device includes a mounting spring extending from the housing and received in the panel cutout. The mounting spring engages the panel to allow the supply power connector to float relative to the panel within the panel cutout for aligning the mating end of the supply power connector with the receiver power connector.