Don't worry, it won't hurt the battery.
Apple released the latest Watch Fast Charger Module Watch Fast Charger Module, this module adopts a separate design, the power part and coil are separate, and uses a USB-C interface, support Apple Watch Series 7 watch wireless fast charging.
At present, Apple has begun to send samples to MFi enterprises, and there will be many Apple authorized cooperative brands to launch third-party watch wireless charging based on this module, multi-in-one wireless charging and other new products.