I'm assuming this isn't a new phone, and that you've previously synced it? Have you reconnected the phone to your computer? iTunes should recognize it, although it sounds like you'll probably need to restore it. If you use iCloud, you should be fine. Otherwise, you may need to restore to your last "good" backup from iTunes.
If you read the instructions for for your new IPhone 4S, you would know that you are supposed to fully charge up the battery first using an AC Outlet in your Home or Office (Plug it in to a Wall Socket in your Home or Office), and let the Battery fully charge up before plugging it into your PC or Mac. 🙂