One of the most critical considerations for power bank buyers and sellers is airline capacity restrictions. The International Air Transport Association (IATA) and most civil aviation authorities worldwide enforce a 100Wh (watt-hour) limit for lithium battery power banks in carry-on luggage. Power banks exceeding this limit require airline approval, and power banks cannot be placed in checked luggage under any circumstances [2][5].
The conversion from mAh (milliamp-hours) to Wh (watt-hours) depends on the battery voltage. For standard lithium-ion power banks operating at 3.7V nominal voltage:
Formula: Wh = (mAh × V) / 1000
26800mAh at 3.7V = (26800 × 3.7) / 1000 = 99.16Wh
This calculation shows why 26800mAh has become the industry standard for 'maximum airline-safe capacity'—it stays just under the 100Wh threshold while maximizing usable capacity [2][5].
Maximum allowed watthour rule or 100Wh equivalent to 27,000mAh, anything higher will need approval from airline [6].
Maximum allowed watthour rule or 100Wh equivalent to 27,000mAh, anything higher will need approval from airline [6].
International flights power bank discussion
However, there's an important caveat that B2B buyers should be aware of. Some airports, particularly in Asia, enforce capacity limits based on mAh rather than Wh. This can create confusion even for compliant products.
Some airports had sign saying no batteries over 27,000mAh, not sure if you can convince them its fine because it doesnt exceed 100Wh [7].
27650mAh airline limit discussion, 2 upvotes
This inconsistency highlights why clear product labeling is essential for Alibaba.com sellers. Products should display both mAh and Wh ratings prominently, along with voltage information, to help buyers navigate different airport regulations. For Southeast Asia exporters, this is particularly relevant given the region's heavy reliance on air travel for business.
Another critical compliance issue emerged in 2025: China's Civil Aviation Administration (CAAC) now requires CCC certification for all power banks carried on flights through Chinese airports, effective June 28, 2025 [8]. This affects many Southeast Asia exporters whose products transit through Chinese hubs.
Make sure it's got the new CCC approval if you're flying through China. CAAC effective June 28, 2025, power banks without CCC mark will be prohibited [8].
Airline travel warning, 8 upvotes