f you’ve lived with mobile devices for long enough, you’ve likely had that moment when you received a low-battery warning well before the end of the day. It’s more than a little worrying, especially if you’re far from home. But how do you wring the most out of your remaining battery life in those situations — or better yet, avoid those problems in the first place? You don’t always have to rely on your phone’s low-power mode. We’ve compiled a slew of tricks that can extend the longevity of your smartphone or smartwatch, and they’re not necessarily obvious — in many cases, it’s as much about discipline as it is flicking the right software switch.