In a battery, the energy is stored as chemical energy, if that's what you mean. The exact details depend on the type of battery.
Chemical energy to electrical energy.
chemical energy
Chemical energy.
No. There are, indeed, ways to convert mechanical energy into electrical energy, but a battery is not usually designed to do this. You can convert mechanical energy to electrical energy by another device, but the battery itself has to be charged by electricity.
A battery
Battery
A battery or a fuel cell converts chemical energy directly to electrical energy
A rechargeable battery.
A cell in a rechargeable battery does that when it's being recharged.
The purpose of a battery is to provide power/electricity to the circuit or other object. to provide energy for the current to flow The electrical cell/battery is designed to store energy in chemical form, and to deliver it in electrical form when required.
mechanical generatornuclear reactorchemical battery
Think about a battery-powered motor. (Granted, the energy is originally chemical potential, but it is transferred to electrical potential when it comes out of the battery.)