That’s the first thing any singer, minister, ceo or broadcaster is going to ask the sound person when there is a wireless mic failure. Wireless mics are much more reliable than they were just a few years ago, but they still are subject to lots of outside interference and will never be as reliable as a cabled mic.
As battery life gets better and better, there is a temptation among sound people to stretch the life of the battery, but they do it at their own peril.
The discharge of a battery when used in a wireless mic is not “linear”, which means that after slowly discharging over an extended period of time, an battery (either alkaline or rechargeable) can quickly lose its remaining power and drop to a voltage where wireless mic performance is no longer predictable or reliable.
While your employer will appreciate your efforts to save a little money when things are going well, if your answer to the “did you change the batteries” question is “no“, then you may find yourself looking for another job.
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