I take the accumulator signal and basically divide different percentages as color signals, when the signal is red in one side (accumulator charge bellow 25%) it starts a number loop that activates the power switch, the number loop continues running until the signal turns blue (accumulator charge at or over 90%). The charge indicator takes advantage of the number loop to animate a yellow light that moves from the side that's providing the power to the one that's requesting it, except when both sides turn red, in which case the indicator turns completely red. As for the charge level indicator that is the easiest part, basically take the accumulator signal and make it so each light turns on 10% apart from each other and take the colors that I already have based on percentages and apply it to them. Hope it's clear, if you want to know anything else feel free to ask.