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Rechargeable AA batteries for UHF wireless mics?
JAOgann:
We are looking into the "low-self-discharge NiMH" (LSD MiMH) AA batteries now being offered. They don't loose their charge quickly when stored and come pre-charged.
Has anyone tried these on UHF AA battery powered wireless mics? There is a lot of info on the forum on 9V but not much on AA's.
We use Shure SLX's.
Some come with "smart" chargers so batteries can be left in them after charge is complete.
These are the brands and models in question:
* Duracell Rechargeable Pre-charged
* E8GE 1000 Ready to Use Rechargeable
* EasyPix Pre-charged Rechargeable
* Panasonic R2 Technology Rechargeable
* Powerex Imedion
* President's Choice Rechargeable
* Rayovac Hybrid
* Sanyo Eneloop
* Sony CycleEnergy
Taylor Phillips:
I don't have any experience with rechargeable AAs in mics, but I use the Duracells you mentioned for my camera. I work as a photographer for car dealers for my day job, and I haven't a problem getting 600-800 pictures(~50% w/flash)on one charge of those batteries. That's usually in one day though, and I recharge them every night, so I don't really know how they'll do when fully charged on Sunday morning, used for a couple hours then sitting all week. They do work better than regular NiMH or alkaline batteries for my use of them.
Darin Brunet:
Shure ( http://www.shure.com/americas/products/wireless-systems/slx- systems/slx1-wireless-bodypack-transmitter ) states that "rechargeable" AA batteries are acceptable for use in both the SLX1 and SLX2 transmitters. However, they also state that the 8+ hours of use are with alkaline batteries, not the rechargeable kind. I would expect that NiMH batteries would provide acceptable performance but maybe not for a full 8 hours of use, since you will be short on voltage. Remember, they do not provide a full 1.5V per cell. I have used them but usually recharged them after every 3-4 hours of use (2+ hours on Sunday, 1+ hours on Wednesdays), putting them in the recharger after Wednesday evening service. BTW, since I remote mount my receivers, the transmitters only go for about 15-20 ft. YMMV.
Christy L Manoppo (okky):
we currently use energizer rechargeables for all of our wireless mics, senn ew500g3 and shure's UR.
So far, 6hrs plus of use every sunday, we don't encounter any problem yet.
also, the battery life depends on some factors;
- transmitter power level (most says 10mW, 50mW)
- recharging habits. (make sure it discharge completely before any recharging cycle begins).
Darin Brunet:
Christy L Manoppo (okky) wrote on Sun, 18 July 2010 23:27
we currently use energizer rechargeables for all of our wireless mics, senn ew500g3 and shure's UR.
So far, 6hrs plus of use every sunday, we don't encounter any problem yet.
also, the battery life depends on some factors;
- transmitter power level (most says 10mW, 50mW)
- recharging habits. (make sure it discharge completely before any recharging cycle begins).
There is no need to completely deplete an NiMH battery before recharging. NiMH batteries do not have the "memory" that older NiCD batteries did.
From Energizer: Battery "memory" is a loss of battery capacity due to partially discharging and recharging repetitively without the benefit of a full discharge. This was evident with early nickel cadmium (NiCd) rechargeable batteries and is not found in nickel metal hydride batteries (NiMH) currently manufactured.
I continually charge and recharge the NiMH batteries in my DSLR cameras, cell phones, AA & AAA's and have never had a problem.
~DB
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