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Originally Posted by squeeforever
On the contrary, the 9920 for instance are only rated for 12 cells on the BEC. A external BEC is required for higher. Let me explain why. The total voltage of the batteries has to go through the BEC or UBEC either way. With a internal BEC, the ESC has a fairly small BEC internally so as to maintain a small ESC, were as obviously, the smaller internal BEC is also gonna have problems disipating the heat. Heat comes to it in the form of watts. Which is gonna be killer on it with a large spike. At least this is how I understand it. Alot of this is still over my head.
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Sorry, I was trying to make that part of my point, just didn't do it well. I did see where the 9920 is listed here as only upto 12 cells with the bec.
My thinking is that the 9920 does have a BEC jumper, so an easily disabled BEC. The then advertize it can run upto 18, then 20, w/o the BEC. The fact that ~every non-BK ESC is only rated upto 12 cells seems to me not necc a coincidence. Most of all these other ESCs are a bit more "plug and play" than the 9920 (or maybe better said a more "mainstream commercialized" unit) as they are encased, no jumpers and such. Perhaps due to marketing/warranty decisions these other makers are not advert higher cell counts w/o a mainstream acceptable method of disabling the BEC, and don't want to face lots of warr claims/ bad press b/c of kids running 18cells on the BEC and frying the ESC when it was advert to due so.
I'm wondering if Quark just decided to do this where others didn't. :032: Looking on their website, no where does it say you have to disable the BEC to run 18 cells. Perhaps this was a clever marketing strategy, figuring most users would be savvy enough to figure out the BEC, but still have the only other big name esc that can run 18cells other than the BKs. Or maybe not. I have plenty of time to think about it since I don't have a esc to run currently....