Adapter Light Always Red, Battery Charge Never Gets Past 99%

Hi.
My 2007 MacBook Pro's adapter is now showing only the orange/red light and never getting green. Also, the taskbar never shows 100% battery charge when the adapter is plugged in, but it does when you first remove the adapter.
My battery life is pretty short nowadays (never more than 45 to 60 minutes) and it's getting pretty hot near where the adapter connects. My fans seem to be running a lot more than usual, too.
Any ideas?

Do non-OEM batteries exist?
"Third-party" may be the better-understood term (I get "OEM" but others may not). Yes, there are some out there. However, one key item makes me nervous about them.
Other World Computing (OWC) sells an amazing number of Mac add-ons and replacement parts. It's my personal experience that they give excellent service after the sale, standing behind what they sell. OWC carries third-party batteries for Mac portables going back to the G3 Wallstreet, but they do not list any MBP batteries. This makes me think that they don't have confidence in what's out there.
Here is a site listing third-party MBP batteries (scroll down a bit):
http://www.global-batteries.com/index.php/cPath/1_12/sort/2a/page/1
Note that the prices aren't much less that what Apple charges, especially for the 17: model. I ordered a battery for a Wallstreet PowerBook from that vendor and it was identical to an Apple-branded battery yin every way except the sticker on it. It was a good battery, but I have no way of knowing if their MBP batteries are from the same vendor as the Wallstreet batteries.

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