A button cell used in watches functions as $\large Zn\left( s \right)\, + \,A{g_2}O\left( s \right)\, + \,{H_2}O\left( l \right)\, \rightleftharpoons \,2Ag\left( s \right) + Z{n^{2 + }}\left( {aq} \right) + \,2O{H^ - }\left( {aq} \right)$
If half cell potentials are
$\large Z{n^{2 + }}\left( {aq} \right) + 2{e^ - }\, \to \,Zn\left( s \right);\,{E^0}\, = \, - 0.76\,V$
$\large A{g_2}O\left( s \right)\, + \,{H_2}O\left( l \right)\, + 2{e^ - } \to \,2Ag\left( s \right) + 2O{H^ - }\left( {aq} \right);\,{E^0}\, = \,0.34\,V$
The cell potential will be

Moderate

Solution

$\large {E_{cell}} = E_c^o - E_a^o = 0.34 + 0.76 = 1.1V$

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