Beijing Capital Airlines モバイルバッテリー飛行ポリシー。

短い回答

Beijing Capital Airlines publishes official lithium-battery and dangerous-goods transport rules through its CMS help module: power banks are treated as spare batteries, prohibited in checked baggage, allowed as hand baggage or on-person only, capped at two power banks, allowed up to 100 Wh by default, require carrier approval from over 100 Wh through 160 Wh, are prohibited over 160 Wh or when rated energy is unmarked/uncalculable, China domestic flights prohibit no-3C/unclear-3C/recalled power banks, and onboard power-bank use or charging is prohibited.