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Author Topic: AT822 Stereo Mic (battery life question)  (Read 420 times)

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Offline billydee

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AT822 Stereo Mic (battery life question)
« on: January 25, 2017, 03:14:47 PM »
I'm considering semi-permanently mounting an AT822 stereo mic in a local venue. I probably do a soundboard/aud matrix recording 2-3 times a month there and it's impossible to get good mic placement unless I set mics up on the small stage but that's not always feasible. So for now I set mics up off to the far side of the room and have had decent results.

The mic manufacturer states that the AT822 has a battery life of 1000 hours (with an alkaline battery). Here's the manufacturer specs-
http://www.audio-technica.com/cms/wired_mics/665bdf92967733dc/

So it it safe (or crazy) for me to assume that if I have the mounted mic turned on and change the battery once a month, I'll be ok? Doing the math I should get 40 or so days of life out of a battery but I surely don't want to push my luck. And I also don't want to have to get up there and deal with it everytime I record.

Thoughts and/or advice appreciated.
« Last Edit: January 25, 2017, 03:26:29 PM by billydee »

Offline kleiner Rainer

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Re: AT822 Stereo Mic (battery life question)
« Reply #1 on: January 26, 2017, 01:40:30 PM »
Billydee,

I would use a Lithium AA battery. Energizer specifies a nominal capacity of about 3500...3600mAh (here: http://data.energizer.com/pdfs/l91.pdf ). Audio Technica lists the current drain at 1.2mA for the AT822, so you can expect a battery lifetime of about 4 months. Changing batteries three times a year should be no problem.

Another advantage is the sightly higher voltage of 1.7V for the lithium cell, giving more headroom for the mic capsule.

Greetings,

Rainer
recording steam trains since 1985

Offline billydee

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Re: AT822 Stereo Mic (battery life question)
« Reply #2 on: January 26, 2017, 02:05:32 PM »
Billydee,

I would use a Lithium AA battery. Energizer specifies a nominal capacity of about 3500...3600mAh (here: http://data.energizer.com/pdfs/l91.pdf ). Audio Technica lists the current drain at 1.2mA for the AT822, so you can expect a battery lifetime of about 4 months. Changing batteries three times a year should be no problem.

Another advantage is the sightly higher voltage of 1.7V for the lithium cell, giving more headroom for the mic capsule.

Greetings,

Rainer
That makes a lot of sense to me and I'll give it a try.
Thanks Rainer!   :cheers:

 

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