If you're able to find one, it may only be useful as a docked device. Battery on models that old are most likely exhausted by now. If you do, and it is, and you want to make it portable, I can recommend the iFixit guide and battery replacement kit... if you've comfortable cracking the case and doing some soldering I just did this with my wife's 1st-gen. Quite amazed that it worked, frankly....
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