Two capacitors with capacitances $$C_1 = 4\ \mu\text{F}$$ and $$C_2 = 8\ \mu\text{F}$$ are connected in series across a 12 V battery. After being fully charged, the battery is removed and the capacitors are reconnected in parallel (positive plate to positive plate and negative to negative). What percentage of the initial stored energy is lost during this reconnection process?