Samsung's new Galaxy S5 doesn't skimp on battery power, with an expected 10 hours of web browsing and 12 hours of video playback on a single charge. When you're on hour 11 of watching cat videos with no charger in site, the handsets new "ultra power-saving mode" will keep your handset purring along by making the screen black-and-white and turning off all the non-essential services on your phone. Even better, Samsung says if you put your phone in standby mode with only 10 percent of the battery left, it will still last "up to 24 hours" before running out of juice.