In this video I tested three of the most popular portable phone chargers people keep grabbing on Amazon: the BY1 2-pack, the iWalk, and the Rorry. I wanted to see which one actually makes the most sense in real life, so I looked at the basics like battery size, output power, what comes in the box, and whether they’ll charge securely with my phone case on. The BY1 is the only one that gives you a two-pack, and each charger shows a real battery percentage, which I like. They’re pretty standard 5V chargers at 5,500mAh each, but they plugged in with my case on and felt secure. The iWalk is smaller and lighter at 4,500mAh, but it pushes 12V, so you’re trading capacity for a slightly faster charge—and it also held tight with my case. The Rorry is the most feature-rich: built-in USB-C cord/strap, battery percentage display, extra cords, up to 22.5W output, and a huge 10,000mAh battery—plus it can charge an Apple Watch. For my circumstances, Rorry is the winner, but if you want lighter weight, iWalk (faster) or BY1 (more charge + two-pack) are solid.