What happens to the oxidation number of $Mn$ during the operation of a dry cell?

In the cell $Zn | Zn^{2+} || Cu^{2+} | Cu$,the negative electrode is

When a lead storage battery is discharged,

Write the chemistry of recharging the lead storage battery,highlighting all the materials that are involved during recharging.

Fill in the blanks :
$1$. Standard potential of Daniell cell is $\dots$ volt.
$2$. In Daniell cell,chemical energy is converted into $\dots$ energy.
$3$. In Daniell cell,$\dots$ is anode and $\dots$ is cathode.

Which metal oxide decomposes upon heating?