Air³ Powerbank 7.000 mAh

AIR³ A-grade Li-polymer batterry Powerbank 7.000 mAh 

AIR³ has a 7.000 mAh battery built in. Depending on your settings (theme, wifi, 4G, brightness level, ...) , it will give you between 7 H and 15 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.