The charging issues you're experiencing, such as not charging or intermittent charging, are often due to protocol and compatibility issues with third-party wireless charging devices. These devices can not fully support the required charging standards or protocols that the Xiaomi 15 uses, leading to charging failures or inconsistent performance.
To ensure a better and more reliable charging experience, it is recommended to use Xiaomi’s official wireless charger, which is specifically designed and optimized for Xiaomi devices, ensuring full compatibility and efficient charging performance.
Regarding in-car wireless charging, Xiaomi has optimized its wireless charging for certain vehicle models, but not all vehicles are supported equally. If you are encountering charging issues in your car, please provide the model details of your vehicle, so further optimization for better compatibility can be considered and addressed.