Filed under: FAQ by Jeff Servaas |
 Older radio microphones needed the full 9V that alkaline batteries provided, so 7.2V and 8.4V NiCD and NiMH batteries did not last long before dropping below the minimum voltage needed by the microphone. In response to this need, MAHA developed 9.6V rechargeable batteries. More recently, newer mics have been designed to work with the standard NiMH battery voltages of 8.4V. As a result of this development, Maha released their 8.4V rechargeable battery. As they have 7 cells inside the battery instead of 8, each cell can be bigger, and the battery has a higher capacity of 300mAh.
If you have mics that are less than 3 years old, we recommend the higher capacity 300mAh 8.4V batteries which will give you around 5-6 hours from a full charge. If you have older mics, go for the higher voltage 9.6V 230mAh batteries to ensure compatibility with your microphones. The 230mAh 9V’s will still give you around 4 hours of runtime.
At our church, a service is typically 90 to 120 minutes, plus a rehearsal of 90 minutes. The batteries are fine to run for the rehearsal time and the service. We use the 8.4V 300mAh batteries some of the radio microphones and in the wireless foldback headsets. Just last month we started using SHURE SLX radio microphones. We are using Powerex 2700mAh AA rechargeable batteries, and these are also lasting through rehearsal and the service. We recharge the batteries after every service, as the NiMH chemistry is fine to be topped up, and does not need to be fully discharged before recharging.
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