Iphone is a brick after update?

I updated my iphone 5 to the latest Ios (ios 7.0.6) and when it was about to restart the phone went blank. The low battery icon shows up so I charged it for several hours and nothing happens, I let it charge again overnight but it has not improved. I tried resetting the phone but it won't let me, the annoying low battery icon keeps popping up. Even Itunes doesn't recognize the phone anymore…

Help?!

Added (1). I charged it for almost a day but it is still low on battery:/

Added (2). It's never been Jailbroken at all, just to let you know.

Try putting it in recovery mode by following these steps.
Plug the device's USB cable into your computer only.
Hold down the device's Home button as you connect the USB cable to it.
When you see the Connect to iTunes screen, release the Home button.

If this doesn't work I'm not sure. Hope this helps you

Agree, but it should still show charging. Use the cable it came with and plug in somewhere else to get it to charge. It can't do an update with low battery.

Exact thing happened to me. As soon as I updated it turned to a brick. Turns out this has happened to a lot of people. Taking mine into the store tomorrow to get it fixed.