RE: Reciever volts ?
Thanks for mentioning that, GG.
Les, the standalone BECs such as the [link=http://www.koolflightsystems.com/ultimatebec.htm]Ultimate BEC[/link], the [link=http://www.dimensionengineering.com/ParkBEC.htm]ParkBEC[/link], and others are a good solution if your ESC doesn't have a BEC or if the BEC is not adequate to power the servos in a particular plane.
As GG said, these standalone BECs are often a better choice than a second battery pack, especially if you're trying to keep the weight down.
- Jeff.