The best thing to do is charge the battery and test it for capacity. Call local auto parts stores, you can usually find one that will test it and if its bad replace it for just the price of the battery. There are many levels of quality and warranty. Your choice is limited only by how much you want to spend and how much warranty you want.
It's possible that the battery is fine but there is a parasitic draw on the battery. Before taking the car to the parts store, make sure anything that can stay "on" when the car is "off" (i.e. dome light, trunk/hatch light, poorly installed radio etc.)
is off. These things can drain a battery over the course of a few hours and cause the problem you're having.
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