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So I posed this question to Ed at Tech Aero:</p>

I am currently running dual Tech Aero controllers (one switch) and 350 ma packs. I have the voltage set to 6 volts on both. Each pack is drawn down pretty much the same.</p>

My question is, if I leave one 350 on one controller, but use a much larger pack (1,000 ma) on the second controller will the draw be the same on both packs (50% from each pack) or will the draw be greater from one of the packs? In other words, do the controllers draw equal amount?</p>

This is his response:</p>

Changing the capacity of the pack isn&rsquo;t going to change the amount drawn from each, so the smaller capacity pack is going to need to be recharged sooner than the higher capacity pack.</p>

So, at least for Tech Aero units, they indeed do isolate the batteries from the receiver and will draw the same amount from each battery.</p></span>