Converting from mains power to battery power

[heldes]

Hi everyone, I have a basic knowledge of electric but would like advice before I attempt, I have a electrical item that is powered by
Voltage input: ~100-240V/50-60Hz
- Output: DC 24V, 2-3A, I would like to make it portable by just using battery power, preferably rechargeable any help would be greatly appreciated thank you all

 

[James]

What is the item?
how long do you want it to run for on a fully charged battery?

 

[heldes]

What is the item?
how long do you want it to run for on a fully charged battery?

Hello James, the item is a tesla coil kit and would like it to run for about an hour at a time