What are the advantages of a lead acid battery compared to a Ni-Cd battery?

Lead acid batteries have beter storage capacity than Ni-Cd, the voltage per cell is normally rated at 1.5V where the Ni-Cad is only 1.2V and it is not so sensitive to its charging current, a transformer and rectifier is all that is needed to charge a lead acid battery vs. the Ni-Cd that need a more complicated charger.