An anonymous reader writes: Opera Software has added a power-saving mode to its desktop web browser that "can increase the battery life by as much as 50 percent." The company claims optimizations are what has made the battery life increase possible, including "reducing activity from background tabs, adapting page-redrawing frequency, and tuning video-playback parameters." Opera claimed that a laptop running Windows 10 64-bit with the power-saving feature enabled lasts 49 percent longer than one with Chrome put under equal stress. Ad blocking was turned on during the test as well. The feature is not enabled by default, but a blue battery icon will appear next to the browser's address bar whenever the power cable is unplugged from your computer. When the laptop's battery is running low, the browser will suggest turning on power-saving mode, too. Earlier this week, Opera launched a new VPN app for iOS that is free to use and includes unlimited data.