First things first, no, it is not. However, recent recalls and bans of power banks in China have sparked public concern over the overall safety of these devices. It began when several power bank manufacturers, including Romoss, started recalling certain batches of their product after their supplier (the China branch of the American battery maker Amprius) changed some parts in the battery cells without notifying them.
This, coupled with some recent news about power banks catching fire or exploding, fanned the concern among users and authorities. As a result, the widely published ban came into effect. However, it has had much less far-reaching effects, as it was imposed by the Civil Aviation Administration of China (CAAC), banning the recalled batches, as well as power banks without the China Compulsory Certificate (CCC) markings, from boarding civil airline aeroplanes starting 28 June. Delivery services also followed suit, banning the recalled batches, resulting in customers being unable to return the items.
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While many are calling for a ban on all power banks without the CCC mark, pundits point out that the mandatory certification was only introduced a year ago, and many consumers are still using non-CCC-certified products. Still, to err on the side of caution, it may be advisable to replace older models, especially if you plan to travel with one.