Во, на Хели директе увидел (свежак что ли? как то раньше в глаза не бросался

) :
CC BEC SWITCHING REGULATOR
Current Output: Peak: 10 amps
Continuous:
<12 volts input = 7 amps*
<24 volts input = 5 amps**Ratings are determined with a 5mph airflow on the BEC. Servo connectors are not rated for current in excess of 5 amps. Users are encouraged to replace the connectors if more than 5 amp currents are anticipated.
Output Voltage: Output 5.1 volts out of the package, user may set output voltage from 4.8 to 9 using the Castle Link (sold separately).
Input Voltage: 5v to 25.2v (2S to 6S LiPo)
Length:
Width:
Height: 1.2” (30mm)
0.6” (15mm)
0.4” (10mm)
Weight: 0.4 oz (11 grams)
--- А вот тут я сполз под стол ...

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No small animals or interns were harmed in the incredibly long development of this product. Some engineers maybe, but that is a personal matter.
They are fine now.
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What the heck is a BEC?
Our Battery Eliminator Circuit is a little device that eliminates the need for a receiver and servo battery pack. It draws higher voltage from the motor batteries and drops it to a voltage level that is suitable for your receiver and servos. This is required in applications which draw high power for multiple servos or use more than 3S motor packs, as most ESCs with linear BECs are not designed for these applications.
CC BEC is better because it is smaller, cheaper, and far more powerful.
See the CC BEC User Guide for more details.
Castle Creations 10A BEC Switching Regulator http://www.helidirect.com/product_info.php?cPath=93&products_id=5159