Why does the Xiaomi Focus Pen heat up when attached to the Xiaomi Pad 7 Pro?

When the Xiaomi Focus Pen is attached to the tablet at 80% battery, it starts charging, which causes both the smart pen and the attachment area on the tablet to heat up. This is a normal phenomenon, and the heating will disappear once the smart pen is fully charged. The tablet undergoes strict inspection before leaving the factory to ensure it is safe under all conditions, so you can use it with confidence.