Wireless microphone manufacturers specify alkaline batteries. A fresh alkaline battery will run a wireless transmitter (depending on the system manufacturer) from eight to sixteen hours. Most wireless microphones will stop working when the battery is below 6.5 volts. An alkaline nine volt cell will often start out at about 9.4 volts and has a great deal of storage capacity. Most of the time it does not matter if you use Duracell, Eveready Energizer, Ray-O-Vac Alkaline, Radio Shack Alkaline, Giant, CVS or any other store alkaline battery. Always have several on hand. You can get them at many discount warehouse stores for as little as $1.25 in quantity. I have found as much as 25% failure rate in the top brands (dead or low voltage). If one does not work try another before calling for service. Do not use the 79-cent carbon zinc battery. It will only last about twenty minutes. The "heavy duty" (beefed up C/Zn battery) may last thirty minutes. Many people ask about rechargeable.
You have to be careful. It is allowed, but not recommended. Use only rechargeable nickel-cadmium (NiCad) batteries that are marked 8.2 volts or higher. NiCads will only run a microphone for about two hours. As they age NiCads build up "memory" if they are not completely discharged every time before recharging.
As a result what may last for two hours today may only last one hour in six months and forty minutes in a year. I recommend having two batteries per transmitter, essentially leaving the transmitter on after the last use and switching batteries from the charger only when you are about to use the microphone again. Recharging may take as long as twelve hours. We have not yet tested rechargeable alkaline batteries with wireless microphones. Therefore I recommend using only normal alkaline cells in all battery operated equipment.
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Experiencing Worship, The Study