Notebook Problems Need Help ASAP

Hi all,
I have a KDS Valiant 6380 Notebook. I am having 2 problems with it. First off, today, I just got the new battery for it off of Ebay. It arrived, and I put it in and it worked excellent. I drained it, and then plugged it into the wall to let it charge. I noticed that the power light was not blinking, telling me that the battery wasn't charging. I figured that I'd let it sit that way for a few hours, in case it might charge anyway. Well, it didn't. I took ran the computer for a little bit without the battery, and it worked fine. Now, I let it sit out for 2 hours. I started the laptop up and now the battery isn't even recognized, and I'm getting a High Temperature warning. After the computer runs for 1.5 minutes, it will say that it has a high temperature. It will then shut down. Just to let you know, the processor fan works fine, and the heatsink and the laptop don't feel hot at all. Any idea what's going on here???