I will shortly be ordering the 3dr video kit. It includes a 3s Lipo fo the air and the ground. Obviously the ground one requires it, but I will probably wire it into my Turnigy 9xr directly. However, for the air I'm wondering why I need a separate 3s Lipo?
I use 4s batteries for primary power. First of all, is the peak 16.8v too much to directly power the vTX and camera? If so, couldn't I just use a 12v BEC to power the vTX and camera? Is there a compelling reason NOT to do this? Another 70 gram battery is huge waste of precious weight. The mah used by the vTX is way less than what I would lose by adding that extra weight.
For the minimOSD, I understand it will draw power from the APM just like the telemetry radio does. Is this generally acceptable? Right now the APM is powering itself, telemetry radio, GPS/Compass module, and the receiver.
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I had a feeling electrical noise might be a factor. I will try it with the 12v BEC first. If it is noisy, I'll fall back to the separate vTX battery.