What BEC to use for MMP 1S version?

[simplechamp]

I just ordered an AE servo (SHV1504MG) so I can use the 2S LiFe directly into the receiver. It's a cheap stock metal-gear servo like the other AE one I have in right now, but is made to handle 7.2V. It was the only cheap HV servo I could find, all others are $90-150 or even more. Might be willing to put a $100 servo into my truggy, but not my TC3 project.