Abstract: Lift battery control system comprising a plurality of lift cages 1 serving a plurality of storey levels 108, where there are means 10,11 for making calls from these levels, and means for determining the location of the lift cage, and for said lift cages control means 1,2,3 . . . containing one or several microcomputers 14 with, among other things, one or several microprocessors 24, and which control means 1,2,3 . . . further contain lift cage drive means 4 and a control apparatus controlling the lift cage drive means 4. The microcomputers 14 constitute a data processing unit 18, which in the joint-controlled lift battery, together with the data processing units 18 of all the other control means 1,2,3 . . . belonging to the battery and controlling separate lift cages, also carries out the controlling of the battery.