Question about Baseus Xiaobai Series

There is no general answer to this question. The rules of the respective airline must be observed. As these are not uniform worldwide, there is no general yes or no.

Most of the time you will come across a limit of max. 100Wh (approx. 27,000mAh). I would therefore not use this one, or one that has more than 20 - 25'000mAh.