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BrianG · 02.01.2008, 02:34 AM

Yeah, at 5s, you most probably fried the BEC. I would always use an external UBEC at anything over 2s or 7 cells. At 5s and a 3A servo load, that's 37.5 watts that has to be dissipated and the BEC is not even attached to a heatsink!

Some people say you can use hte built-in BEC up to 3s, but I've run tests before and the BEC heated up fast with just a very small load at 3s.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	02.01.2008, 02:34 AM Yeah, at 5s, you most probably fried the BEC. I would always use an external UBEC at anything over 2s or 7 cells. At 5s and a 3A servo load, that's 37.5 watts that has to be dissipated and the BEC is not even attached to a heatsink! Some people say you can use hte built-in BEC up to 3s, but I've run tests before and the BEC heated up fast with just a very small load at 3s.