As long as all components are connected correctly, the battery can not damage your receiver. So you should select the battery based on factors such as the type of motor, the size of prop, and the weight of your plane.

The usual way of connecting the components is shown in the diagram below.

The battery and motor are connected to the ESC. The thin 3-wire cable from the ESC is connected to the throttle channel of the receiver, usually channel 3. The servos are also connected to the receiver.

In most ESCs, there is a feature called the battery eliminator circuit (BEC). The BEC takes the battery voltage and regulates it down to a voltage that is safe for the receiver and the servos. This voltage is fed to the receiver through the same thin 3-wire cable that connects to the throttle channel on the receiver.

When you use the BEC feature of your ESC, as most of us do, the battery is never connected directly to the receiver. The battery is connected only to the ESC, which regulates the battery voltage so that it is safe for the receiver and servos.

An alternative way to power the receiver and servos is with a separate receiver battery. If you do that, you must disable the BEC in your ESC and connect the separate receiver battery directly to the receiver, plugging it into the 4/B connector on your R114F. The receiver and servos are designed to operate on 4.8 to 6 volts, so if you use a separate receiver battery, it must be one that is no more than 6 volts.

If you choose this method, your plane will have two batteries. One will power the receiver and servos. The second will power the ESC and motor. Using two batteries adds extra weight to your plane, which is why most small electric planes use just one battery. The battery eliminator circuit (BEC) lets you eliminate the second battery.

- Jeff