Please bear with me if this is a fundamental question.
Let's suppose we have an RC circuit, charging a capacitor up to the voltage of a battery of 9V. The capacitor is currently at 9V, we switch the 9V battery with a 3.3V one.
Because of the difference in potential of 5.7V between the capacitor and the battery, does current now flow into the battery?
What are the dangers when this happens? Am I trying to charge it at this point?