now pop the shell back on carfully feeding out as much of the panels wire and making sure the 2 batter terminals fit in place.
if the shell wont fit figure out what is blocking it from closing , you may need to move the wires a little or make a notch in the shell by the batteries like i did, just make sure you dont take out to much or the batteries wont meet the contacts.
once it all fits pop 2 rechargeable batteries in and give it a test, if it still powers on, remove the batteries and then screw in all 6 tri wing screws. if it doesn't you may have crossed a wire or over heated the board.
now how i tested it to make sure it charged is i used up the power in the rechargeable batteries then l left the gameboy in my window for about a full day and then tested it to see if the batteries charged.