Why should we have to buy extra parts to stop battery drain??!!! This product should never have been released before you worked out to stop battery drain! You mentioned 40mps is all it takes I got a technician to measure my output he said its closer to 70mps!!! Now I’ve got to put a timed relay in to shut the power off completely because of Rock Liu’s incompetence you are bang out of order!! Are you going to compensate everybody who’s had to lay money out??