Duty cycle, power, target

The performance specification and the acceptable cost of a battery depend, of course, on its application. Here we are concerned with traction batteries, primarily for use in road vehicles, and we have concentrated our attention upon urban buses and light delivery vehicles. In order to define the battery performance targets it is first necessary to consider the operational problem from the point of view of the traffic manager, who specifies the journey profile which the vehicle must be capable of making, and then to select a particular design of vehicle in order to interpret this duty cycle in terms of energy and power requirements and the permissible mass and volume of the battery. When this was done, we arrived at a specification of battery performance for each class of vehicle (Table l). 

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