This is the Castle Creations Castle BEC - Battery Eliminator Circuit. This works with 2S to 6S LiPo batteries.
Eliminates the need for a separate battery for the receiver and servos
OverviewOur 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.
SpecificationsCurrent Output:Peak: 10 amps
Continuous:<12 volts input = 7 amps<24 volts input = 5 ampsRatings are determined with a 5 mph 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: 1.2" (30mm)Width: 0.6" (15mm)Height: 0.4" (10mm)Weight: 0.4 oz (11 grams)