2. Why does Avantree Roadtrip show 10% battery after charging?

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.

Starting from the 23H1 batch, the battery level will no longer be displayed on the phone. Instead, the device panel will feature four additional charging indicator lights. A white flashing light indicates that the device is charging, and each light represents 25% of the battery level. When all four lights become solid white, it signifies that the device is fully charged.