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Was the battery new or just charged? An old battery will reach a point where it will only take a surface charge and will start the car fine but go dead in a few hours. Have the battery tested most auto parts stores do this free. If it is good the have your alternator tested to make sure it is charging. Many auto part stores will do this for free also. If it is, then the real fun starts, finding the short. to find a short get an amp meter and hook it up between the neg battery terminal and the (removed from battery) negative battery cable with the car shut off. It should read less than .5 amp draw, any higher will drain the battery pretty quick. If above .5 amp have a friend remove fuses one at a time and watch the meter when it drops you have found the circuit, trace wires etc. on that circuit to find the short. A common problem with batteries going dead when a car sits is a glove box light, or trunk light that fails to go out when they are closed.

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Q: What could be draining your car battery The battery was fully charged and placed in the car and everything worked ok. When you came back out of work the battery was completely dead?
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