[suicideneil]

That diagram is correct- it works for lipos or nimhs if you want to wire packs in series.

As for the capacitors, there are some on the BEC itself, but those are part of the BEC itself, an unrelated issue so to speak concering the servo and rx power circuits. The capacitor you need to buy is for the main power circuit- novak used to sell an item for the older hvmaxx esc that was perfect, but the newer style item they sell has some flaming death related issues at present, so I would say digi-key or radio shack is your best bet for what you want- a low esr 25-35v cap with 2000-4000uf of capacitance. I would say ebay, but you usually only find giant reels of them for sale, by the dozen or more when you onyl want one or two...