Can someone please provide technical info on the max current limit supported by the built-in USB Charge port.... Is it 0.5A ? 1.0A? or 1.5A?

(I ran into issues twice where the LS-1 board buttons started to light up in all kinds of odd ways by itself and froze while an iPad was being trickle charged by it. It was already charged past 90% and still frazzled the board)

I stopped using the charge port until I know more about its current ratings. I don't want to damage it of make it unstable.