A direct current(DC) power supply was used to give off voltage to the cells. Voltage was slowly raised by small increments of around 0.05V and then data was collected on the current.
These multimeters were used to measure voltage and current. Wires were connected from the DC power supply to the multimeters and two (positive and negative) to the cell itself. Data collection was manual, and the graphs were then generated in an Excel Sheet.