Theand batteries are smaller than last year's, delivering a somewhat disappointing battery life. If you find yourself running out of juice mid-day, the new phones include a feature that automate the process of conserving energy.
Here's how: Head to Settings > Battery. You'll see two options: Power Saving Mode and Ultra Power Saving Mode. The former disables a few key features that won't impede your phone's performance. The latter, Ultra Power Saving, goes to the extreme by making your phone go grayscale and disabling all features, save for a few key apps.
To enable the features, do so in the Settings screen. Alternatively, you can quickly enable either mode through Quick Settings (accessible by swiping down from the status bar).