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There might be some electrical component that is slowly draining the battery. Here is a simple way to narrow it down. This is best done at night. Remove the positive battery cable from the battery (with everything turned off, even the dome light). Gently touch the battery cable to the battery terminal. If there is anything draining current you will see a little spark. To narrow down the source, repeat this test after removing one fuse at a time. When the spark stops, note the number of the fuse removed, and which accessories are fed by this fuse. While you have the terminal off, it's a good idea to clean both the battery terminals and cable ends with a wire brush. If you do not have a slow drain on the battery, here are some other possible causes: your alternator is not charging the battery, often the problem is the voltage regulator (mounted to the back of the alternator). The voltage regulator is a good place to start as it costs only $20, an alternator is closer to $200. More likely, if you still have the original battery, it is 7 years old which is about max life on a car battery. If this morning starting problem has been getting worse slowly over time, it is most likely the battery. They are at their weakest in the morning when the battery and motor are both cold, so the battery has less power, and a cold motor is much harder to crank over than a warm motor.
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Why does battery drain while driving Volvo 940?
Alternator is defective or battery has a dead cell.
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Why wont my battery stay charged on a 1996 crownvictoria?
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<improved answer>Just to correct the old answer, if the CMOS battery is dead, then the computer will not turn on in order for you to reenter it the next morning. It means that the CMOS battery is getting weak, and yeah, you could replace it. <old answer>It is most likely that the CMOS battery is dead. Replace it.
What keeps draining your car battery?
Either the battery has a dead cell, which will normally drain it overnight, or something is on pulling power from the battery. If the battery has a dead cell it will have to be replaced. The easiest way to determine this is to fully charge the battery and then disconnect the negative cable overnight. If the battery is dead in the morning it has a dead cell. You may not even be able to charge it with a dead cell. If the battery is still fully charged the next morning then you have another problem. Check all the lights on the vehicle. Under hood, trunk, dome, curtorsey, glove box, etc. One of them may be staying on. Also check your brake lights. If you find no lights are on then you may have a relay that is sticking. Can be power windows, locks, seat, etc.
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If you have to jump start your battery every time you cut your car off what is wrong with it?
Dead battery, Alternator not charging, Ignition off draw draining battery,.............
