Capacitor Discharging

These are the plots of the data I collected from a simple charge discharge circuit in my physics 2 class. All I did was set up a single capacitor to a resistor and connected both to a 6 volt battery to charge up to aproxamately 5.7 volts. I then disconnected the battery from the circuit, allowing the voltage to be discharged. This data is the rate at wich the voltage is reducing in steps of 5 seconds.