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If you have a charger, hook it up and see if the battery accepts a charge. If it does, you may have left a door ajar. If it doesn't, then the battery is probably shot.
Now if you don't have a charger, you might want to take the battery to the dealership to have it checked. After all, if it is still covered by the warranty, you could end up with a new one. If the warranty has expired, a better replacement for a standard lead-acid is the leak and vibrationproof ACDelco AGM battery.