Here is another good reference, The 12 volt side of life.
Can't get the link to work so just Google "12 volt side of life".
To find out if your battery still has a load on it a Clamp-on Ammeter is a usefull tool, but make sure you get one that measures both AC and DC current. Here is a link to a meter that Sears sells.
Sears.com
Of course, you could just disconnect the battery, negative lead, and see if the battery still dies.
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