A great opportunity for lowering the energy footprint of lithium-ion secondary cells is the re-use of those. Batteries that have been taken out from electric mobility due to their capacity loss are likely to find use in a different kind of application – e.g. stationary. For the re-use of cells that have been in a battery application before, it is essential to test those cells. A charge and discharge cycle of the battery can provide information on the tendencies of the important parameters and the behaviour of said cell. One topic of special interest during this test is safety as cells have a significant potential of fire when mistreated. The following master thesis aims towards electrical conception, planning and construction of a measurement system for high-energy lithium-ion battery modules. Those modules are to be re-used after their first application. Electrical dimensions such as cell voltage, temperature, charge / discharge current, charging time, and discharging time are measured thus providing information on the quality of each individual cell. The protective functions that have been implemented perform in redundant manner and must prevent harm to both the battery modules and the operator. Additionally there is a possibility of balancing the voltage passively during operation. Result of this project is a fully functional model that has been tested on fulfilment of agreed tasks and correct handling of errors. Potential improvements have been identified from practical implementation and tests. The documentation of the model device is part of this thesis. The discoveries and findings during the design process are expected to improve next-generation models on this project.