Download and run Coconut Battery to get a better idea of what is actually going on and let us know your results. Any watt adapter will work, but the higher wattage ones will charge faster.
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http://www.coconut-flavour.com
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http://www.coconut-flavour.com
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UPDATE
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Coconut says it is discharging, was the MagSafe plugged in when you ran it?
Download and run Coconut Battery to get a better idea of what is actually going on and let us know your results. Any watt adapter will work, but the higher wattage ones will charge faster.
http://www.coconut-flavour.com