Finding the best phone battery life in 2020

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Smartphones with long battery life

There are lots of things to consider when buying a new phone, and battery life is one of the most important.

Of course, it's great to have a good camera, a gorgeous touchscreen, a fast processor and more - but without any charge in your battery they're no use at all. So to help you choose the best smartphone, we've put together a list of the best performers when it comes to battery life.

Hints and tips to help you choose

Screen resolution depends on two things - the number of pixels in the display, and the size of the display.

The categories HD, Full HD, 2K and QUAD HD tell you the number of pixels, as follows.

  • HD: 1280 x 720
  • Full HD: 1920 x 1080
  • 2K: 1920 x 1080
  • 4K (also known as Quad HD): 4096 x 2160

If you see Full HD+ this means the panel displays the same 1080 pixels horizontally, but has more pixels vertically than Full HD because of the wider aspect ratio.

But this only gives you half the picture. The larger the screen, the more the pixels are spread out. If you know both the number of pixels and the size of the screen, you can work out the pixel density in PPI (pixels per inch).

For example, Samsung Galaxy S9+ has a 6.2-inch Quad HD display - which works out at 529 PPI. By contrast, iPhone X has a 5.8-inch display with 458 PPI. But since the human eye struggles to tell the difference in resolution beyond around 300 PPI, other factors such as the ability to display a wide range of colours are at least as important - if not more so.

Because Android and iOS devices don't all come with the same capabilities, it's difficult to say which phone type has the best battery life or which lasts longest. But it's safe to say bigger battery doesn't always mean a longer time between charges.

Some phones, like the Samsung Galaxy S8 or iPhone 7 can do more with less. If you want to know which phone is best for long battery life, check out the specs for talk time and audio playback, for example, and don't just consider the battery size.