Experiments were made with negative lead-acid battery electrodes doped with 1% of powdered carbon, titanium dioxide and silicone dioxide. It turned out that addition of carbon to the negative active mass causes an increase of the time of effective formation. During accelerated cycling in the PSoC regime, the electrode with carbon has in the course of the first PSoC run better properties than the electrode with titanium dioxide. The electrode with silicone dioxide performs the lowest cycle life. In the second PSoC run the electrode with carbon did not show a markedly better performance than the electrode with titanium dioxide. The positive effect of both carbon and titanium dioxide additives on the electrode cycle life is evident.