Mg(s) | Mg2+(aq)Au+(aq) | Au(s)
AL(s) AL3+(aq) ll Zn2+(aq) ll Zn(s)
Ni(s) | Ni2+(aq) Ag+(aq) | Ag(s)
A voltaic battery is also known as a voltaic pile, which is a set (or pile) of galvanic cells linked together in series to create a larger voltage than could be generated by a single galvanic cell. Therefore a voltaic cell would simply be one element of the pile which is also one galvanic cell.
0.92V
4.2 V
Mg(s) | Mg2+(aq)Au+(aq) | Au(s)
Al | Al^3+ Zn^2+ | Zn
Al(s) | Al3+(aq) Ni2+(aq) | Ni(s)
Zn(s)/Zn2+(aq)//Au+(aq)/Au(s)
Mg(s) | Mg2+(aq) Au+(aq) | Au(s)
Mg(s) | Mg2+(aq) Au+(aq) | Au(s)
Zn(s)/Zn2+(aq)//Au+(aq)/Au(s)
Zn(s)/Zn2+(aq)//Au+(aq)/Au(s)
Zn(s)/Zn2+(aq)//Au+(aq)/Au(s)
AL(s) AL3+(aq) ll Zn2+(aq) ll Zn(s)
Zn(s)/Zn2+(aq)//Au+(aq)/Au(s)
Ni(s) | Ni2+(aq) Ag+(aq) | Ag(s)