What voltage and amperage battery should i use to power the board independnt of the comp

i wanted to set up a system without connecting it to a computer or 5v adapter.
i didnt want to try anything for fear of burning the board.

what is the recommended ,max and min amps needed to power the board and if i do need a component i wont get at a regular electronics shop where i can get it from

Same Specifications as your smart phone.
Suggestion: you can use the power bank ( which is used to charge smart phone)