Cool, glad to see you just bought a new head unit. It's pretty simple to change those out. Plus, Crutchfield gives you all the installation gear you need. They should've included a wire to run over to your fuse box. I ordered my stuff from them and had to do the same thing in my VW Rabbit.
If you would've wired it directly to the battery you would have to turn the power button off on the radio to turn it off or it would always be on even with the key out of the car. The power should be connected in your fuse box to something that only works when the key is on like your wipers.
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