Questions about Atra Solar Charger DA69

It depends on the sunshine but I don't recommend the system, it's better to take a solar panel with just a usb plug to charge a battery. I have this model and I never know when the battery is full and if it works properly

Yes, as long as the powerbank can be charged with a current of "DC 5V/2.1A", this is possible.

I have had the Charger for quite a while and it charges well. The fuller, the more blue lights (maximum 4). When you press the button, it either switches on or off. When folded up, it also switches itself off after a while. If you then charge devices with it, the lights start to glow blue when the voltage in the battery pack drops below a low level, but the battery pack also switches itself off when it has nothing left to charge. I have never used it on the road, but I will certainly do so in the summer. It's a very cool and useful piece of equipment.

Hello Asco12, this question cannot be answered as a general rule, as each airline handles this differently. According to the IATA (International Air Transport Association), batteries with a total capacity of up to 100Wh are allowed in hand luggage. However, this guideline is not implemented by every airline. To be on the safe side, it's best to ask the airline (by email, you'll have something in writing). They are generally not allowed in checked baggage.