A Universal Battery Elimination Circuit (UBEC) is a 'switch mode' DC regulator that takes the high voltage (up to 26 volts) of the main battery pack and converts it to a consistant and safe 5 or 6 volts (selectable) for your receiver and servos. A UBEC is needed if the Electronic Speed Control (ESC) being used for the motor does not have a built in Battery Elimination Circuit (BEC), or if the BEC of the ESC is inadequate to power the number and/or size of servos being used.

Using this UBEC is a safer way to go on large models for the following reasons:

1. Most built-in BEC circuits are 1 to 2 amp 'linear mode' circuits which are only useful for 2 or possibly 3 standard size servos when using a 3 cell Lipo battery. If you use more servos, or a higher voltage battery pack, you will almost certainly overload the BEC, causing a crashed model.

2. In an ESC with a built-in BEC, excessive heat generated in the ESC by the current draw of the motor and/or BEC can cause total loss of power to the receiver/servos, resulting in a crashed model. The chance of total loss of power is greatly reduced when a separate receiver battery pack or UBEC is used. If the ESC overheats and shuts down (no power to the motor), you will still have power to the receiver/servos, and will be able to maintain control of the model.

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Pentium 40A ESC Manual