RE: PowerCore II 6700 - Compact Portable Charger for iPhone X / 8 / 8 Plus, Samsung,
It's perfect for charging a smartphone twice.
The battery does not discharge, even a month later without use (unlike the model in the form of lipstick that discharges in a week if it is not used). This is a very important point !!!
This is the best value for money-clutter I find! This external battery is perfect for taking it everywhere!