Why won't my Macbook Air charge?

My Macbook Air (late 2010) stopped charging and recommended a battery replacement. After replacing the battery with one purchased off of ebay, the computer still turns on when plugged in, but it will not charge. A very faint light is shown on the magsafe. I'm wondering if the problem is with the new battery or if there is another issue internally. Any diagnostic advice would be much appreciated.
Thanks

themachead wrote:
But to be completely fair Apple had a bunch of bad batteries they had to replace...
Qualify 'bunch'.  That is simply not the case at all.
people come here to report problems,
its easy to consider there is a a problem with things when you stick your head in an emergency room, which is what these boards are.
which is a false statistical sampling, and more still a sample from the wrong place.
All batteries produced for Apple contain microprocessor chips for SMC communication.

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