NOT ENOUGH JUICE
PROBLEM: Despite the fact that transmitter battery life is a top concern with wireless mics, users continue to try and cut operating costs by using inexpensive batteries. Most wireless manufacturers specify alkaline or lithium single-use batteries because their output voltage is very stable over the life of the battery. This is important because most transmitters will exhibit audible distortion or signal dropouts when supplied with low voltage. Rechargeable batteries often seem like the ideal solution, but most rechargeables provide about 20 percent less voltage than a single-use battery — even when they are fully charged.
SOLUTION: To combat battery problems, carefully compare the transmitter's voltage requirements with the battery's output voltage over time to make sure that the battery will last through a full performance. Lithium-ion and rechargeable alkalines usually work well, while Ni-Mh and Ni-Cad batteries may last only a couple of hours. This issue is specific to 9-volt batteries; AA rechargeables offer similar performance to single-use AA batteries.
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