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Old 10-26-2008, 18:59   #1 (permalink)
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Does this battery need to be replaced?

It happened two times in the last week that the battery was out of power, and I had to use jumper to start the car. Does this battery need to be replaced? By the way, the weather became cold at last weekend.

Thank you in advance!
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Old 10-26-2008, 19:03   #2 (permalink)
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Re: Does this battery need to be replaced?

If the alternator is charging I'd say replace the battery
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Old 10-27-2008, 08:34   #3 (permalink)
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Re: Does this battery need to be replaced?

Assuming there is not some excessive parasitic current draw when the car is sitting turned off and the alternator is good yes the battery is bad. But I would not just change it out.

You need to test the alternator/battery voltage and test the current draw after the car has set for an hour or so. The current draw should be less than 50mA. The battery voltage when the car is running with as many electrical loads that you can apply and at 1500 rpms should be over 14 volts.
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Old 10-27-2008, 10:36   #4 (permalink)
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Re: Does this battery need to be replaced?

Thank you guys. I will check them ant report the results.
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Originally Posted by SHOZ123 View Post
Assuming there is not some excessive parasitic current draw when the car is sitting turned off and the alternator is good yes the battery is bad. But I would not just change it out.

You need to test the alternator/battery voltage and test the current draw after the car has set for an hour or so. The current draw should be less than 50mA. The battery voltage when the car is running with as many electrical loads that you can apply and at 1500 rpms should be over 14 volts.
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Old 10-27-2008, 10:41   #5 (permalink)
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Re: Does this battery need to be replaced?

If you check the current draw the meter has to be connected and them let the car sit for a hour so all the modules time out and go to "sleep".

It's also informative to check the voltage of the battery after you have shut off the car for 15 minutes and then again after the car has set for 8 hours or so.
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Old 12-30-2008, 09:07   #6 (permalink)
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Re: Does this battery need to be replaced?

My car would not start if I don't use it for 2-3 days then I give it a boost and it will start everytime. Usually on Mondays after the car have been sitting for the whole week-end it will not start. I took the battery to charge and they told me at Autozone that the battery was good. I had this battery for 3 years and it is guaranteed for 6 years. I think i have a small drain. Can anyone tell me how do I go about finding if I have a drain in my battery. How do I measure this small drain and where should I check for battery drain. Any help would be appreciated.
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Old 12-30-2008, 09:40   #7 (permalink)
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Re: Does this battery need to be replaced?

Use an amp meter between the negative cable and the negative post on the battery. Then start pulling fuses. 50mA is the normal draw after all the modules have timed out (about 5-15 minutes).
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Old 12-30-2008, 14:26   #8 (permalink)
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Re: Does this battery need to be replaced?

Thank you for your response. If I understand you correctly... after I connect the ampmeter between the negative battery cable and the negative batery post, the current should be less than 50mA. What do I do if it is higher?.... Do I then pull fuses or one at a time?... If I find the fuse that is carrying a higher than 50 mA current, then what do I do? How do I fix it. How do I use the ampmeter to diagnose the circuit?

I will appreciate if you could take me through the diagnostic steps. It is the first time I am attempting to do this.
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Old 01-01-2009, 18:48   #9 (permalink)
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cool Re: Does this battery need to be replaced?

Quote:
Originally Posted by barbaro1 View Post
Thank you for your response. If I understand you correctly... after I connect the ampmeter between the negative battery cable and the negative batery post, the current should be less than 50mA. What do I do if it is higher?.... Do I then pull fuses or one at a time?... If I find the fuse that is carrying a higher than 50 mA current, then what do I do? How do I fix it. How do I use the ampmeter to diagnose the circuit?

I will appreciate if you could take me through the diagnostic steps. It is the first time I am attempting to do this.
See my reply in your own thread.
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