A secondary battery capable of improving the cycle characteristics and the swollenness characteristics is provided. The channel equalizer may include a feed forward filter and a switching unit. An image synthesizer circuit is connected to the phase sampling circuit and arranged to receive the phase sample data therefrom. The base member has an opening to deliver a wire from the outlet into the mirror housing assembly. The image forming apparatus, the fixing unit and the belt assembly includes a frame, a belt rotatably disposed at an outer periphery of the frame, and a lateral slip prevention member which presses at least a portion of the belt to cause the belt to move in a direction of mitigating undesirable lateral movement of the belt.