I would personally worry that 3 amps are not enough. I would recommend switching to a Castle BEC, but you could hook that one up first and see how it does before actually making that decision.
Thanks Harley,
So I just need one BEC attached to the battery, right.
The Novak BEC included in the package only rate for 3 amp output.
(http://www.shopatron.com/products/moredetail/part_number=5463/135.0.1.1.19780.35126.0.0.0?tp=spec)
Do you think it's sufficient for SDX-901 (http://www.sanwa-denshi.co.jp/servo-01.html#SDX-901)... ?
Rgds,