The latest Samsung Galaxy and Google Pixel smartphones offer decent battery life, but there's still a pretty big difference between them that you might not realize. They both include large batteries in their newest phones, rated to last for more than a day per charge. Battery saver modes can extend that by limiting features. There are lots of other ways you can extend battery life on your Android phone, like dimming brightness, turning off location services and automatic Wi-Fi connection, and limiting apps that run in the background. But this one key difference isn't something you have as much control over. And it's hidden in the fine print.