If you feel that your battery isn't charging because the battery level indicator on your phone isn't increasing/is stuck, check the Roadtrip and see if the LED is RED. If it is RED, it is actually charging. It just doesn't show immediately on your phone. All you need to do is to turn the car kit OFF and ON again. Now your phone should reflect the new battery level.
In sum: the battery level on your phone is not accurate, use the Roadtrip's LED to guage power level.
Note: For the best charging experience, please use the included USB type C cable to charge.