Say I have a charge of +q and -q on the positive and negative terminals of a battery. If I connect wires to each terminal, but don't connect the wires (essentially creating an open circuit), the charges move around to neutralize the field in the wire.
During this transient state, charges move around. Would the charge on each terminal of the battery decrease a little during the transient state, since a field exists for a short period of time?
In other words, does the voltage and charge of the battery slightly decrease during the transient state?