Turn AAA batteries into AA batteries in emergancy

All you need to do is roll up some tin foil into a flat circular shape the size of the battery that you need,circomfrence,not the actual size of the battery,put it against the spring on what ever gadget you need the batteries 4,then push the little AAA battery on the tin foil so it fits tight into the slot where the AA bigger battery should be and WALLA, sorted.your gadget should now work,and its the same principle with all batterys.