iPod classic 120 gb won't charge

Hi everyone

I have a 120 gb iPod classic which I've had for a few years now. Since I've gotten my iPhone I've been leaving it in my car for easy access to listen to music. I haven't used it for a few months now and so I decided to charge it while I was driving using my car charger. It was working fine and so I decided to bring it inside to charge and nothing happened. It wouldn't charge at all. I tried all of my home chargers and nothing. I don't think it's an issue with the battery since I have never really used that iPod much and it had just been charging. Now it's completely dead and when I plug it into a charger a quick message of "connect to power" pops up before the screen goes black again. Please help if you can!