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Yes. Zendure power banks can be with you in your carry-on luggage, if the capacity falls within Federal Aviation Administration’s safety limit. You are allowed a portable charger that's rated up to 100 watt-hours. Anything over that and you need permission from the airline. To Calculate Watt Hours in Power Banks, it's simple math.
It depends on different capacity and component.
Yes. Zendure wall chargers can be used in other countries with USA/UK/EUROPE plugs.
It depends on different product model. For a portable charger with a micro USB input, you can go ahead and charge with the included micro USB. Zendure portable chargers with USB-C can be fast charged with the USB-C cord included in the box.
You can charge Zendure power bank while charging your devices at full speed with a single wall charger, a feature rarely seen in other power banks.
The Zendure A-Series is compatible with almost all Apple and Android smartphones, tablets and other USB-charged devices. Zendure’s X6, SuperMini and SuperTank feature low power charging mode, which can charge an almost unlimited range of low-power devices such as smart watches, Bluetooth earphones, fitness bands, and much more. You can also use A6PD, A8PD and SuperTank to charge your laptop.
About 500.
If it is running in charge-through mode and the power source is disconnected or turned off, the device will switch to battery power almost instantaneously.
Not all third party Apple accessories are MFI certified by Apple. If your third party Apple accessories is not MFI certified by Apple this could be why you are having trouble. 
Please try using the cable with different devices. If the cable still does not work please contact our support team at (support@zendure.com)