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

Thank you for your support of Xiaomi products and we apologize for any inconvenience caused. When the Xiaomi Focus Pen is attached to the Xiaomi Pad 7 and its battery level is below 80%, it begins the charging process. This can cause both the pen and the area where it attaches to the tablet to warm up. This is a normal occurrence as the device charges, and it should not be a cause for concern. Once the Xiaomi Focus Pen reaches a full charge, the temperature will return to normal. The Xiaomi Pad 7 has undergone a thorough inspection process during production to ensure its safety in various usage scenarios. Rest assured, you can continue using the device confidently and safely.