MOXOM MX-PB168 40000mAh Power Bank

A large cell built for days away from a socket rather than an afternoon: enough to refill a phone several times over, or to keep a tablet and a pair of earbuds going through a long journey.

Capacity of this order comes with weight, which is the honest trade. It belongs in a bag rather than a pocket, and it is the one to take camping or on a flight where the seat power does not work.