Ven-Dens VD-PB041 10000mAh Dual-USB Power Bank

No fast charging, no screen, no wireless pad — two USB sockets and a 37 watt-hour cell, which is all a power bank has to be. At six dollars it is the one to leave in a glovebox, a drawer or an emergency kit and forget about until the day it matters.

Both outputs run at 5 V 2 A, so two phones charge at ordinary speed at the same time. The polymer cell carries the usual protections against overcharging, overheating and short circuits. It refills over 5 V 2 A itself, which is slow — that is the trade at this price, and it is the honest one.