Macbook Pro Charger Won't Charge Battery

I am so baffled, my charger just randomly stopped charging my computer today. The light is on and is red and there's no damage that I can see to the cord, so I don't think it's the actual charger that's the problem. If I leave the charger plugged into the MBP the battery life doesn't diminish, but it also doesn't increase. I've tried changing outlets but that doesn't help - nor should it as it's plugged into the same outlets I always use.
I just had my computer's battery replaced about a month ago. I bought my computer May 2007 so it was time. Why I am already having problems with it though I don't understand. Can someone please tell me what's going on with it!
Thanks.

Welcome to Apple discussions.
Check that the 4 pins on the magsafe are not bent. Also check that there's no dirt in the sockets they engage with. Be very careful doing this!
Next remove the battery and reinstall it - just in case it's not seated properly. Also check while doing this that the contacts are clear of any dust and not damaged.
Open System Profiler to check what it says about the battery in the Power sub-menu. If it indicates that all is well consider going back to where you bought the battery to get things checked out.
Note that the battery should recharge on mains power but not drop charge unless it needs to supplement the mains power for certain operations.
If you do find anything get back to the forum with your report.
Neville

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