Bought new battery for Mac Book Pro and it won't charge/hold charge...HELP!

My MBP has been running solely on power adapter for months, I finally bought a replacement battery for my MBP 15" and installed it to charge yesterday. The light on my adapter never turned green. And when I went to unplug it, it immediately powered down, even thought it showed 15% power on the screen. When I press the silver button on the battery all five light up green. What am I doing wrong here?? Also, even if the new battery is in the computer and my power adapter is in the computer still powers down. What next??

I hope the warranty on your junk battery will be honored. You wouldn't be the first person to be victimized by the sellers of such junk batteries, many of whom have failed to honor their so-called warranties or been completely untraceable when push came to shove.

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