Anyone who uses a smartphone knows the importance of carrying a backup power bank. But given the overwhelming number of options on Amazon, you might feel overwhelmed, understandably. Besides the various charging specs, ports, and even cables you have to consider, there are a ton of competing brands. It’s common to see products from Anker, Mophie, and MyCharge, but how do you know which ones deliver on their promises? Is it worth saving a few bucks if a battery pack’s performance is lacking?

Power-bank cheat sheet

Our quick-hit recommendations:

We decided to do the legwork for you, acquiring a wide range of power banks from different manufacturers, some offering unique features. We then spent weeks testing the packs (read about our testing process in detail below).

While we’ve made some top picks, be sure to read through each review, linked to at the bottom of this page, to help you find the best battery pack for your needs. (You might also be interested in our our roundup of USB car chargers if you spend a lot of time in a vehicle.)