The Adapter Zero-Volt fits to the 19-cell battery of the Eurofighter Typhoon jet. By means of fitting resistors each cell will be discharged down to zero volts. Dependant on battery producer’s prescriptions the battery is kept on zero-volt-level for deliberate time. The operation on a fully charged battery is not critical. The resistor-matrix, which is heating up during the discharge process, is protected from touch by a coated hood. BT2000 CT/E is earlier free for next test-procedure when using this additional adapter.