A hearing aid includes: a housing having an exterior surface and an opening at the exterior surface; a battery door moveably coupled to the housing; and a spring element located in the housing, wherein the spring element is aligned with the opening of the housing to allow actuation of the spring element by a tool that is inserted through the opening of the housing; wherein when the spring element is actuated by the tool, the battery door is allowed to be fully opened, and when the spring element is un-actuated, the battery door is prevented from being fully opened.