A common rechargeable battery is the nickel-cadmium, NiCd, battery where the two reactions during discharge are as follows. \( Cd(s)+2OH^{-}(aq)\rightleftharpoons Cd(OH)_{2}(s)+2e^{-} \) \( 2NiO(OH)(s)+2H_{2}O(l)+2e^{-}\rightleftharpoons 2Ni(OH)_{2}(s)+2OH^{-}(aq) \) Deduce the overall cell equation.