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Air³ Powerbank 20.000 mAh with Solar panels and magnetic USB cable.
AIR³ A-grade Li-polymer batterry Powerbank 20.000 mAh with solar panels and magnetic USB type-C cable.
AIR³ has a 10.000 mAh battery built in. Depending on your settings (theme, wifi, 4G, brightness level, ...) , it will give you between 6 H and 12 H of autonomy.
According to your goals (several days trekking, avoid the worry if you forget to recharge the battery before takeoff, very long flight with maximum energy consumption,...), you may be willing to extend the energy capacity to never have to worry about it.