No damage to the battery, just a slower charge. The iPhone supports wireless charging, so it can be charged using a wireless power bank. The use of wireless charging bank is more convenient than the traditional wired charging method, just put the phone on the wireless charging bank to start charging.
However, it should be noted that the efficiency of wireless charging will be slightly lower than that of wired charging, which means that the charging speed may be slower than using wired charging. In addition, some wireless power banks may heat up, especially when the phone is being used while charging.
If you often need portable charging or like the convenience of using wireless charging, using a wireless power bank is a good choice. But if you need a quick charge or have limited time, it may be faster and more efficient to use wired charging. Ultimately, which way to charge depends on individual preferences and actual needs.