Battery systems, battery modules, and a method for cooling a battery module are provided. An output signal from a camera signal processing circuit 4 is selected by a switch 5 to be supplied to a chromatic aberration correction unit 6. With use of such a codebook, a base station can transmit simultaneously to subsets of mobile terminals associated with these subsets of code vectors with minimal interference therebetween. A portion of a speed control handle on the vehicle abuts against the cam member to define an end of the range of motion of the speed control handle. The wear resistant face contacts the pad.