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When the battery is disconnected, how can it run down over a 4 hour period?

(2008 Ford Escape)
in Piedmont, SC on May 18, 2010
I had my battery replaced and that night, it was down again. I had it taken back home and checked. No one knows what's wrong. Only a dealer can tell with the computer check thing.
their charges are always double what the local garage charges. Why? How do you find the recall list on this car?
Displaying 1 answers & 1 comments
Popular Answer
A fully charged battery should read 12.6 volts, with the battery disconnected a good battery will not discharge if left for two or three weeks. It sounds like the battery is defective. Two tests for a battery is a hydrometer test (not always possible on modern batteries) and a high rate discharge test. Turn on the ignition switch to the on but not run position do you see an icon on the instrument panel representing a battery, if you do not see this battery icon the alternator is not seeing power to allow it to charge. Start the engine does the battery icon go out. Put a volt meter across the battery terminals with the engine off, at rest the battery voltage should be 12.6 volts if the battery is fully charged. Now get a friend to start the car while you watch the voltmeter, the voltage reading across the battery should read approximately 14.6 volts if the alternator is charging correctly.
on May 19, 2010
Buddy's was able to start up my car by disconnecting 3 of the computer cables. The car will not turn off at ignition switch. I believe since it would not cut off even with disconnected the fuel sensor something drained the new battery. One person said that the computer was still being told ('for some reason)' that it needed energy. Computer is not getting a message because of defective part . What could that be? My first battery I kept is still good after charging. I paid the fee and kept it on a hunch.
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