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Old 14th May 2017, 00:12
  #5 (permalink)  
Join Date: Apr 2008
Location: Nearer home than before!
Posts: 511
I think the batteries are needed to make the circuit. Our aircraft are a mixture and on twin plug, I get 2-3 weeks from good batteries but wth the XLR5 Mike/box fitted and connected they last months!

That's with just a few days every now and again on a twin plug plane. So you do need the batteries installed but current drain is negligible.

Hope that helps?
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