iPhone 5 won't start, just shows battery with bars when charging

[batteryi]

My iPhone 5 refused to start, so I charged it overnight and it was still showing the battery with a few red bars this morning. Resigned to the fact that I would lose unsaved data anyway, I tried to restore it through itunes. It downloaded a software update, even got to the apple logo and the bar filled up all the way!

And then it went back to the battery with red bars screen again

I've tried pretty much everything I've seen in forums. What can I do to revive it? Is the battery gone?

 

[hang-the-9]

May not just be the battery, could be a hardware problem with the phone. Nothing more you can do without having it looked at by a tech.