Most of us are heavily reliant on our phones. So when your iPhone is low on battery and there’s no outlet in sight, it can be a stressful situation. Thankfully, there are some settings you can adjust that can help you squeeze a few more hours out of your battery.

For nearly two months now, Apple’s iOS 9 has been available for upgrade. But if you have yet to make the switch, you may still be curious about its new features and whether or not they make it worth installing. If this is you, here’s what you need to know about iOS 9 and four of its most popular new features.