The new “Low Power Mode” in iOS 9 is a pretty handy way to extend your battery life when you’re on the go; by throttling down your device’s CPU and suspending all background activity it lets you gain two to three extra hours in a pinch. You can turn it on manually by going into Settings, Battery or your iPhone, iPad, or iPod touch will offer you the option to turn it on as part of the warnings you get when your battery drains…
