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Question:

Can I power a 9.8V RC reciever with an 11.1V battery pack?

I will have the battery hooked to the receiver through an ESC, but will it still be too much voltage for the receiver to handle?The receiver is a Spektrum AR-500.

Answer:

Yes. If you have any worries, you could use an Adjustable-Voltage Regulator, LM317, and bias it up to get exactly 9.8 volts when powered. But it really isn't necessary, for the same reason that a 12V car radio will work when the regulator is putting out over 14, or the battery has as little as 10.5.
If you don't want it to work, you could do that.
I've never seen a RX pack on that voltage. Most run on 4.8 ot 5.0 volts. You are talking TX voltage. Most RX's would suffer with that much voltage.
Too much voltage. Strong risk of burning up the circuits in the Spektrum AR-500. I wouldn't do it.
You don't have a 9.8V receiver. The AR-500 requires a supply voltage of 3.5 to 9.6 volts. However, depending on your setup you will need 4.8V-6V going to the receiver because otherwise, you'll burn out your servo(s). If your ESC has a battery eliminator, it will put out some voltage around 5 or 6 volts that you can use to run your receiver. If your ESC has no battery eliminator, you need a separate battery eliminator or regulator.

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