Anker <b>621</b> Magnetic Battery (MagGo)

Slipped this in my jacket pocket for a weekend trip and it charged my phone from dead to about 80% during a two-hour layover. The magnet held fine through TSA and all the jostling, which honestly surprised me.

The magnetic snap is surprisingly strong, it stayed put on my phone even through a bumpy train ride. Barely adds any bulk in my pocket and got me through a full day of sightseeing without hunting for an outlet.

The magnetic snap is so satisfying and strong that my phone and this battery basically act like one unit when I'm walking around with it. It's genuinely turned my commute into a stress-free zone since I never have to worry about hunting for a cable or a wall plug.