Need Help!

My GNex is messed up. It keeps showing the battery charging indicator even after i disconnect it. And my battery is draining really fast! Weird, i had ordered a new case from eBay and it was delivered yesterday. And this happened like, 5 minutes after i put it on! Surely it can't be related right?

What can i do? I DON'T want to flash my phone.

Is it a hardware or software issue?