Definition of «dead battery»

The phrase "dead battery" means that the battery no longer has any power or energy left in it, and is unable to function.

Nor do you have time to deal with dead batteries. (polesawadvisor.com)
In the case with the headphones, we found a USB charging cable and standard 3.5 mm headphone cable that can be used in case of dead battery. (digitaltrends.com)
Also, there were dead batteries in the remote for the TV / DVD player. (luxuryretreats.com)
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