Photo by Allison Johnson / The Verge

Once upon a time, phones such as the original Motorola Droid had interchangeable batteries. You could keep an extra charged battery on hand and swap them out when needed. It was a lot more convenient and lightweight than dragging around a heavy battery pack, and it kept the phone going strong over the course of the busiest workday.

But as phone designs changed over the years, swappable batteries were abandoned by phone manufacturers to keep their phones sleeker and accommodate wraparound screens. Improved battery technology means that most phones will get you through at least a full day’s use — unless you are watching a lot of videos or your device is a year or two old.

If your phone is running out of gas before you go to bed, you’ve…

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