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How to add and power a Bluetooth receiver to battery powered speakers? Answered

I have a iHome speaker that is powered off 4 AAA batteries. I want to add this bluetooth receiver to the speaker.

The bluetooth receiver is powered off USB, but I want to keep the system battery powered.  Can I take apart the bluetooth receiver and solder the power connections to the power connections on the speaker?  

The speaker is powered off 4 AAA batteries, so 6 volts.  (How many amps??)
The bluetooth is powered from USB which is 5 volts, correct?  

Would the 6 volts from the AAA batteries damage the bluetooth receiver?  What about current?

Discussions

The voltage tolerance of the receiver may be able to handle the 6V. But you can always by a 1N4001 diode and solder that between the receiver and the power source. The diode has a 1V voltage drop so the receiver would only get 5V from the power source.

The current will look after itself. Use Mpilch's diode and you shouldn't have a problem.