Rapid development of the automotive industry and motorization has been observed in Poland over the last decade. This phenomenon has increased the amount of used car batteries requiring recycling and has thus posed new challenges for their processing. Orzel Bialy S.A, is the major secondary lead smelter in Poland. This paper describes the program for smelting technology modernisation and productivity increase through the application of oxy-fuel burners, which has been implemented at Orzel Bialy S.A. The main objective of smelter modernisation, which was to increase the furnace productivity by 20%, has been achieved. This paper outlines the previous and present state of the lead acid battery scrap smelting technology at the "Orzel Bialy" S.A. Specifications of the burners and of oxygen installation are given. Industrial tests with the modeinised smelting technology and optimisation of the process parameters are described, and the results obtained are discussed.