This self-discharging will over time make the cell out of balance with the posolyte accumulating reduced Fe(Bhmbpy)3. To overcome this, we can expose the negolyte to air so that excess reduced BHPC is oxidized by oxygen. The oxidized BHPC may then be reduced at the negative electrode to oxidize the reduced posolyte species, rebalancing the cell. Similar strategies of rebalancing the cell were used in various reported research. Fe(Bhmbpy)3 -BHPC capacity balanced cell (Fig. )