Xiaomi BHR9822GL Magnetic Power Bank 10,000 mAh, 33 W

Magnetic and cabled at once, which covers both halves of the market from one line. It sticks to a compatible phone with no cable at all, and the USB-C lead built into the body charges everything that is not magnetic — an Android handset, a tablet, a pair of earbuds — at up to 33 W. That matters here because magnetic packs usually only suit one brand of phone, and a shop that stocks only those is turning away every other customer who walks in. 234 g. No mains plug.