Abstract: A low tire pressure system has a transmitter inside a vehicle tire attached to the wheel rim. A housing has an outboard wall perpendicular to a wheel radius and an inner flange around the wall periphery. A battery is mounted on the circuit board through an intermediate support frame. Battery leads extending through snug holes in the support frame are soldered to the circuit board to achieve a unitized assembly. The assembly is installed in the housing with the circuit board parallel to the wall and its margin bearing on the inner flange. Centrifugal force developed on the battery is transferred by the support frame through the board margins to the flange without bending the circuit board.