Hallo buddies, I baught a small vox ac2 amp (it's a great lil thing) to be able to take it with me anywhere. It fits in the pocket of the guitar cases.. It works with 6 aa batteries but you can buy separetely a supplier. Vox says "DC 9V 500mA or higher". What's the difference if buy a 500mA or a 1000mA or 1700mA? Which choice is better? Sorry if my question is very newbish Im newbee too Thanks a lot!