A system for providing a scale of electrical charge of a vehicle battery, the system comprising: a scale of state of charge (11, 21) of the vehicle battery; and a controller arranged to display a current value of charge indicator (12, 24) on the scale (11, 21), the current value of charge indicator (12, 24) indicating the state of charge detected by a detector, wherein the controller is arranged to control the current value of charge indicator (12, 24) to appear on the scale (11, 21) between a displayed first indicator (14, 22) indicating a first minimum state of charge and a displayed second indicator (15, 23) indicating a first maximum state of charge when the vehicle is in a first driving mode, wherein the displayed first indicator (14, 22) and the displayed second indicator (15, 23) define a range therebetween; the system is characterised in that: the controller is arranged to control the current value of charge indicator (12, 24) indicating the state of charge detected to appear on the scale (11, 21) between the displayed first indicator (14, 22) and a displayed third indicator when the vehicle is in a second driving mode; the third indicator indicates a second maximum state of charge; the second maximum state of charge is higher than the first maximum state of charge; and in that, when the vehicle is in the second driving mode, the displayed first indicator (14, 22) and the displayed second indicator (15, 23) and the range therebetween are displayed, and an extension to the range is provided between the displayed second indicator (15, 23) and the displayed third indicator. a scale of state of charge (11, 21) of the vehicle battery; and a controller arranged to display a current value of charge indicator (12, 24) on the scale (11, 21), the current value of charge indicator (12, 24) indicating the state of charge detected by a detector, wherein the controller is arranged to control the current value of charge indicator (12, 24) to appear on the scale (11, 21) between a displayed first indicator (14, 22) indicating a first minimum state of charge and a displayed second indicator (15, 23) indicating a first maximum state of charge when the vehicle is in a first driving mode, wherein the displayed first indicator (14, 22) and the displayed second indicator (15, 23) define a range therebetween; the system is characterised in that: the controller is arranged to control the current value of charge indicator (12, 24) indicating the state of charge detected to appear on the scale (11, 21) between the displayed first indicator (14, 22) and a displayed third indicator when the vehicle is in a second driving mode; the third indicator indicates a second maximum state of charge; the second maximum state of charge is higher than the first maximum state of charge; and in that, when the vehicle is in the second driving mode, the displayed first indicator (14, 22) and the displayed second indicator (15, 23) and the range therebetween are displayed, and an extension to the range is provided between the displayed second indicator (15, 23) and the displayed third indicator. the controller is arranged to control the current value of charge indicator (12, 24) indicating the state of charge detected to appear on the scale (11, 21) between the displayed first indicator (14, 22) and a displayed third indicator when the vehicle is in a second driving mode; the third indicator indicates a second maximum state of charge; the second maximum state of charge is higher than the first maximum state of charge; and in that, when the vehicle is in the second driving mode, the displayed first indicator (14, 22) and the displayed second indicator (15, 23) and the range therebetween are displayed, and an extension to the range is provided between the displayed second indicator (15, 23) and the displayed third indicator.