I have a Karma here that does not turn on. I have a newer battery fully charged and the controller fully charges, but when I swipe up on the controller screen, I get the message, "Karma not found be sure that Karma is powered on". I have pressed the start button many times but nothing happens. There is no voltage on the black and white wires connected to the battery. I have not been able to measure voltage on the battery, however; all of the LEDs light up.