Low battery.

What do you do when your phone tells you it's running out of battery?

One, you put it in the low power mode. The phone itself starts using battery judiciously until it's put on charge.

And two, more importantly, you are conscious of how you use the phone, how each activity affects the remaining battery.

What about your body, though?

It also tells you when it's running low on battery.

What do you do then?