It is also the most critical component of the vehicle. Through the years, several battery types have been developed. Other types are under development. Cycle life, energy and power density are important characteristics of EV's batteries. Volume and weight savings are particularly important for on-board battery chargers.
Normal charge is the usual daily charging procedure.
For road vehicle applications, it seems interesting to be able to charge the batteries in a much faster way. During subsequent charge and discharge cycles small differences will be emphasised between different battery elements. For this reason, it is necessary to apply a equalising charge at regular intervals. The electricity must be supplied by the electric mains . For the normal charging one needs an ordinary outlet, present in virtually every house.