Why does the Xiaomi Focus Pen heat up easily when attached?

If the Xiaomi Focus Pen heats up easily when attached, please refer to the following information:
1. When the Xiaomi Focus Pen is attached to the pad with 80% battery remaining, it will initiate a charging process. During this process, both the stylus and the attachment area on the pad can become warm, which is a normal phenomenon.
2. The heat will disappear once the stylus is fully charged. The pad undergoes rigorous inspection before leaving the factory to ensure it is completely safe under all conditions. Please feel confident using it.