You could wire up the battery terminals to a 3V power supply. If you are anything like me you have a a bunch of old phone chargers, and all kinds of other car chargers that probably come pretty close to 3V. There is also 3.3V from the computer power supply. I don't know how sensitive the remote is, but I would think it would be ok. On the bright side, if you fry it they are only 10 bucks from the mp3car store.
