Portable phone battery: what to choose in 2026?

In 2026, pretty much all portable batteries support fast charging, so it's mostly about choosing between capacity and size. If you're taking it in your backpack, look for 20000 mAh and up - that'll keep your phone alive all day, but they're pretty heavy. For your pocket, 10000 mAh is enough, compact and lightweight, but one charge will max out give you half a day of heavy use. The main thing is check that the connectors are compatible with your phone, especially if you've got something non-standard.