My engine loses power at a traffic light and going up canyons, I go to turn and put the gas to the floor mat and the car does not drive. The battery indicator shows a one bar. I have called and complained to Toyota, however they tell me that there is no way that the battery could be defective. I don't know exactly what is causing the problems but the battery bar level is showing at 1 and when it goes up to 3 the vehicle continues to drive.