Razor handles (10) are provided. In one aspect, a razor handle includes a housing (14, 16) constructed to hold a battery (18) , an aperture (90) in the housing, a microporous membrane (92) covering the aperture and sealed against a surface of the housing surrounding the aperture, a cover (94) disposed over the membrane and aperture, and a space provided between the cover and the surface of the housing, the space being configured to allow gas exiting the aperture to escape from under the cover. In another aspect, a razor handle includes a housing constructed to hold a battery, the housing being configured to be held by a user during shaving and to receive a razor head (12) , an aperture in the housing, and a microporous membrane covering the aperture and sealed against a surface of the housing surrounding the aperture .