FlyingMonkey Posted January 3, 2014 Report Share Posted January 3, 2014 Not all Dynons have the back up battery, my first CT set up just like yours didn't. The battery is required if you are going to fly at night per ASTM, or at least that is my understanding. Ah. My D100 was missing the battery when I got it from the previous owner. I added one. Link to comment Share on other sites More sharing options...
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