Rob,

Another option is the Tech Aero dual regulator setup. Very light and easy to use and gives you redundancy. One problem I have seen with the simple setups is that you have the possibility of a switch failure and that has always scared me. With the Tech Aero setup you can run two small Lipos, I run dual 350's, with the perfect switch option. So, for very little weight penalty and still much less than a stock 1100mah NiCd, or LiFE, you get added redundancy. I don't believe there are many RF link problems anymore. Not to say there are none, but they are few and far between, much less than power system problems with batteries and switches. After almost losing my Black Magic a couple of years ago to a bad cell, I have run the redundant setup exclusively since then.

Arch