“It's running out of juice.”
You're on a long car trip with a friend. You've been watching the directions on your phone, but now the battery power is getting low. You tell your friend.
It's running out of juice.
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When an electronic device's battery is low, you can say that it has "run out of juice". "Juice" is a slang term for electrical power.
You can also say things like:
It's almost out of juice.
It doesn't have enough juice.
Other phrases for talking about a low battery are:
My phone is dying.
My battery is almost out.
When the amount of some kind of supply becomes low, you can talk about it like this:
The printer is running out of ink.
Or you can say that you are "running out of" something:
We're running out of toilet paper.