Abstract: The present invention relates to a process for working up waste active-mass of consumed, broken accumulator plates, deriving from rubbish-shoots, into active mass, wherein the waste active-masses removed from positive and negative plates are deacidified, washed with water, separately stored and then subjected to heat-treatment. According to the process of the invention the air-dry positive or negative active-mass or the mixture thereof is subjecteda) to heat-treatment at a temperature of 630.degree. to 700.degree. C. for 8 to 60 minutes, then either ground in a manner known per se or fed into a lead-powder mill in an amount of at most 80% by mass, calculated on the mass of the lead charged into the mill, and in both cases ground to an average particle size of less than 60.mu., orb) to grinding in a manner known per se, preferably to an average particle size of less than 60.mu., then subjected to a heat-treatment at a temperature of 630.degree. to 700.degree. C.