A low battery is the warning that a device is nearly out of power. A low battery warning, the low battery light, running on low battery.
The percentage is an estimate rather than a measurement — a battery's charge is worked out from voltage and history, which is why phones sometimes die at fifteen per cent. Cold makes it worse, and a warm phone recovers what a cold one seemed to have lost.
1nounlow batteryThe warning that a device is nearly out of power.
“My phone showed a low battery warning, so I turned off the music.”
low battery is a warning.
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