What is the difference between a fuse and a battery

Dear Student,
FUSE:
A fuse is an electrical safety device (a component) that stops the flow of current into an electrical circuit when the current in the electrical circuit is too high.
It is a length of wire that melts (breaks or blows) when the current through it is above a certain level. This level is called its rating.

BATTERY:

​​​​​​A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of a redox reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit.

The basic power unit inside a battery is called a cell, and it consists of three main parts: two electrodes (terminals) and a chemical called an electrolyte in between them. The difference between a battery and a cell is simply that a battery consists of two or more cells hooked up, so their power adds together.

So, you can see that there is no relation between a fuse and a battery.
They are different in every aspect.

Regards