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09.02.2008, 06:54 PM
On 2s, using the MM's BEC doesn't matter. The difference in voltage (7.4v vs 6v) is low enough that there is little heat at the current the servo is pulling, especially on a small truck. Actually, UBEC can be LESS efficient on 2s because of the low voltage differential. Anything higher than 2s though, and the switching BEC have a clear advantage.
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