In order to improve the corrosion resistance of Pb anodes in 4 M Pb-H2SO4 batteries, the electrochem. and metallurgical effect of Ag addition in small quantities on Pb corrosion in 4 M H2SO4, as well as its microcrystalline morphol., were herein studied.Different techniques, such as PDP, EIS and OM, were employed.The results showed that Ag addition up to 1 wt% led to a significant decrease in Icorr and Ipass rates, and also to a reduction in sulfation phenomena, by facilitating PbSO4 and PbO conversion into PbO2.All of these improvements led to an increase in the lifetime of the conventional Pb-acid battery up to 87.24%.Therefore, the new improved battery is more resistant, durable and environment friendly.T effect on the new casting alloys CR was also studied, and found to be inexistent.