"low on battery" is correct and usable in written English.
You can use it when you need to explain that something is nearly out of power or energy. For example, "My laptop is low on battery, so I'm going to plug it in."
When Baymax is low on battery power he becomes a silly, Chaplin-esque drunk.
Is your phone always low on battery and chewing through data?
I really am curious, and I can't check right now because my phone's pretty low on battery.
That might sound a little worrying at the best of times, but when you're running low on battery it's doubly problematic.
A low power mode is available, which claims to add three hours to the battery life by shutting off push and email fetching, automatic downloads and reducing the performance of the processor, but seemed to do little when I activated it when low on battery.
Have you ever been on the go and noticed that your smartphone is low on battery?
For the most part, residents appeared to follow officials' advice to stock up on bottled water, canned food and flashlights — so much so that stores ran low on batteries.
An intelligent assistant would enable your phone to recognize that you're at an airport, that you have two hours until your next flight, that it's lunchtime in your original time zone so you're probably hungry, and that your phone is low on batteries.
Running low on batteries, diapers, socks ― whatever ― go online, order and click the free two-day delivery option.
Heritage added that she had "the name of a Bond girl, the hair of a Winkleman and the voice of a Katie Price robot running low on batteries"; describing her as "electrifying", he hoped that she would return.
Therefore, its transmission has to be optimized so it can be reliably decoded by cell edge users with low latency and low impact on battery life.
