When every second counts, these are the best options to conserve your phone's battery.

At some point, we have all anxiously watched our phone battery hover around the danger zone of 5% or less.

Phones are lifelines, and when your device is dying, every percentage counts. Maybe you need the phone to book your ride home. Maybe the power went out in your apartment and you need your phone to stay informed and connected until more help arrives.

For my own small and big emergencies, I know from my unofficial testing that my phone can only last about four minutes once I hit 1% battery, and then it putters out in a quiet death. But could I squeeze out a few more crucial minutes?

Whatever the emergency, all of us need to learn how to conserve power on a phone when we need it most. I asked two phone experts about what works best.

1. Turn on your phone’s low battery mode

If you need to conserve your dying phone battery efficiently, use the built-in tools that your phone already has. On iPhone settings, toggle on your phone’s low power mode, and on Android devices, go to battery saver mode.

Turning on this phone-survival option reduces your network connection, pauses automatic downloads and limits or turns off visual effects and background app activity.

When your phone is on the brink of death, you want to slow down all battery-draining activities and limit how fast the phone’s processor runs, said Arthur Shi, a battery expert and electrical engineer for iFixit, a website that allows people to share........

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