Well, one thing they (IATA) do is set the rules for air transport of hazardous lithium-ion batteries. I see, from a listing for a power bank on ebay, that there are some Chinese suppliers who openly admit to flaunting these safety regulations.
Quote from the listing:
" 5、 The delivery time of each country's post office is different, the arrival time may be delayed, please be sure to wait patiently
6、Our product capacity is large, if the huge capacity (MAH) is printed on the power bank, it can not be allowed to transported by the aircraft,so our products are not printed capacity information, please understand
7、We ensure that the product 100% is brand-new, but the transport time is long, and the collision in the transport process may cause a small number of product damage, which is unavoidable, if there is damage please contact us in time. "