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Quick Tech Tip
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.
Quick Tech Tip
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